iMEV - Ecobuild

................... 

................... 

NATURAL AND ENERGY-EFFICIENT 

VENTILATION SYSTEMS FOR 

DOMESTIC BUILDINGS 

................................................................... 

CI/SfB (57) 

Uniclass L753 

November 2007

......................... ................................ 

...................................................................... 

CONTENTS 

INTRODUCTION 4-5 

Passivent systems, Technical context 6-8 

EXTRACT VENTILATION SYSTEMS 9-10 

Passive Stack Ventilation (PSV) 11-15 

PSV Whole-House 12 

PSV Single-Stack 13 

PSV Design and Installation 14-15 

Mechanical Extract Ventilation (MEV) 16-23 

Passivent MEV 18 

Passivent iMEV 19 

Passivent AV 20-21 

Passivent Flair 22-23 

Positive Input Ventilation (PIV) 24-25 

BACKGROUND VENTILATION 27-29 

Window vents 30-41 

Fresh wall vents 42-44 

ACOUSTIC VENTILATION 45 

Acoustic solutions: Systems 46-47 

Acoustic solutions: Background ventilation 48-53 

COMBUSTION AIR VENTILATION 54-56 

COMPONENTS, SERVICES 57 

Selected components 58-61 

Design and support, Services 62-63 

References 64 

..................................................................... 

3

4 

........................................................................................... 

PASSIVENT… the natural and energy-efficient ventilation specialists 

Passivent Limited are the leading 

specialists in natural and energy-efficient 

mechanical extract ventilation for domestic 

buildings. 

● Expertise 

Passivent have an unrivalled expertise in 

designing and developing ventilation 

solutions to meet the most up-to-date 

technical and regulatory requirements. 

● Immense experience 

During the last 15 years over 30 000 

Passivent systems have been installed in 

the UK alone, giving efficient and effective 

ventilation at all times. There is also a vast 

range of experience with Passivent systems 

over many years in Europe. 

● Technical and design capability 

We can provide authoritative technical 

support, advice and design services. 

● Comprehensive range 

The Passivent range provides ventilation 

systems and products tailored to all types 

of domestic applications. 

● Energy-efficient 

Passivent systems are extremely energyefficient, 

typically providing higher energy 

ratings than other forms of ventilation. 

They offer many advantages over other, 

non-responsive, systems. 

● Building regulations compliance 

Passivent systems can be used to meet 

building regulations requirements 

throughout the UK and Ireland. 

● Innovation 

We are constantly developing our 

ventilation systems and components to 

meet new requirements and further 

improve performance. 

● Quality assurance 

All Passivent systems and components 

have been designed, developed and 

manufactured under a BS EN ISO 9001 

Quality Management System. 

Independent auditing provides the user 

with assurance that the products will fulfil 

their intended purpose. 

...........................................................................................

.......................................................................................... 

PASSIVENT SYSTEMS OVERVIEW 

● Passivent offer a range of passive and 

mechanical extract ventilation systems 

which meet the requirements for 

dwellings set out in Building Regulations 

Approved Document F (England and 

Wales), and similar requirements for the 

whole of the UK and the Republic of 

Ireland. 

For more details of Building Regulations 

requirements see page 8. 

● Passivent BBA Certificated PSV and MEV 

Whole-House systems provide the 

required functions of: 

- extract ventilation to remove pollutants, 

and 

- whole building (background) ventilation 

to provide a supply of fresh air 

These systems have major advantages over 

ventilation based on individual extract fans. 

● Passivent window/wall ventilators can 

provide whole-building (background) 

ventilation for Intermittent Fan (System1) 

and Continuous Mechanical Extract 

(System 3) systems by others. 

● Positive Input Ventilation (PIV) is an 

alternative strategy which is acceptable 

under Approved Document F provided 

compliance can be demonstrated. 

.......................................................................................... 

5

6 

......................... 

......................... 

NATURAL AND ENERGY-EFFICIENT VENTILATION FOR DOMESTIC BUILDINGS 

................................................................... 

PASSIVENT SYSTEMS 

Passive Stack Ventilation (PSV) see pages 11-15 

(Approved Document F System 2) 

Applications: Public and private housing, primarily for individual 

houses and flats. 

New-build, major refurbishment 

Main features: Continuous demand controlled ventilation, silent operation, 

no energy consumed 

Mechanical Extract Ventilation (MEV) see pages 16-23 

(Approved Document F System 3) 

Applications: Public and private housing. Houses, flats, 

multi-occupancy buildings such as nursing homes, 

student accommodation, hotels. 

New-build, major or minor refurbishment 

Main features: Single central fan connected to multiple extracts, 

continuous low-level ventilation, quiet operation 

Positive Input Ventilation (PIV) see pages 24-25 

(Approved Document F paragraph 0.15) 

Applications: Public and private housing. Houses, flats. 

Major or minor refurbishment 

Main features: Ductless system, easy to install. 

Background Ventilation see pages 27-44 

(Approved Document F Systems 1, 2 and 3) 

Applications: Public and private housing. Houses, flats, multioccupancy 

buildings such as nursing homes, 



Main features: Large range of controllable window and throughwall 

vents. 

Acoustic Ventilation see pages 45-53 

(Approved Document F Systems 1, 2 and 3) 

Applications: All types of housing in areas of high noise levels 

Main features: PSV, MEV and background ventilation with acoustic 

treatment for sound reduction 

...................................................................

......................... 

......................... 


................................................................... 

TECHNICAL CONTEXT 

Why ventilate 

Ventilation is essential in all buildings for 

the well-being and health of the occupants 

to: 

● Provide a supply of fresh air for persons 

using the building, creating a comfortable 

environment. 

● Extract moisture at source from areas 

where it is produced in significant 

quantities (eg kitchens and bathrooms), 

thereby combating condensation. 

● Dilute and remove pollutants including 

dust mites, tobacco smoke and cleaning 

chemicals, promoting a healthier air 

quality. 

● Aid the removal of occasional high 

concentrations of pollutants and water 

vapour. 

● Ventilation may also be used to improve 

thermal comfort and reduce overheating 

of buildings in summer. 

Energy savings 

Buildings are being made more and more 

airtight, driven by government regulations 

to save energy and reduce carbon emissions. 

Previous fortuitous ventilation routes (by 

natural infiltration) are being sealed, 

increasing the importance of an effective 

ventilation strategy. 

The need to reduce energy consumption and 

combat climate change means that energy 

savings must be made in buildings. It is 

therefore vital to select an effective and 

energy-efficient method of ventilation. 

Passivent systems are proven to be among 

the most energy-efficient. 

Energy efficiency and SAP 

Government action in response to climate 

change is driving the demand for increased 

energy efficiency. By 2016 the Government 

wants all new dwellings built to be ‘zerocarbon’. 

As part of building regulations 

improvements, all new housing has to be 

energy rated; this is achieved through the 

Standard Assessment Procedure (SAP). 

Passivent PSV with no electrical 

consumption and automatic operation is 

naturally energy-efficient. 

To allow flexibility and encourage 

innovation, energy-efficient systems can be 

independently tested and their actual 

performance used in the SAP through the 

‘Appendix Q’ route instead of the SAP default 

value. 

The use of energy-efficient DC fans in all 

Passivent MEV systems makes them more 

energy efficient than the SAP MEV default 

value. 

Health benefits 

Proper ventilation of buildings has been 

shown to help reduce the incidence of 

asthma and other allergy related problems. 

Controlled ventilation 

Traditional buildings had a considerable 

amount of accidental ventilation through air 

infiltration. In order to reduce energy loss, 

modern buildings (and refurbished 

buildings) are increasingly required to meet 

standards for reduced air leakage. By itself, 

this would lead to problems arising from 

lack of ventilation. 

A ventilation strategy is therefore required to 

provide good indoor air quality whilst 

minimising energy loss through unintended 

air leakage. The concept of 'build tight - 

ventilate right' means: 

- Minimising the amount of accidental and 

uncontrolled air leakage through the 

building envelope 

- Providing controlled ventilation to supply 

the required level of fresh air and expel 

moisture vapour and other air pollutants. In 

other words, ventilation where and when it 

is needed. 

................................................................... 7

8 

......................... 

......................... 


................................................................... 

TECHNICAL CONTEXT 

Ventilation design 

A designed ventilation strategy should make 

use of the following elements: 

● Extract ventilation from 'wet' rooms 

including kitchens, bathrooms, utility 

rooms and WCs, to remove water vapour, 

together with other pollutants, directly 

from the rooms where it is mostly 

generated. 

● Whole building ventilation to provide a 

supply of fresh air from outside. This also 

has the function of diluting and dispersing 

pollutants wherever they are generated 

within the building. 

● Purge ventilation to remove high 

concentrations of pollutants generated by 

occasional activities such as painting and 

decorating. 

Building Regulations requirements 

The basic requirement of regulations is that 

there should be adequate means of 

ventilation for the occupants of a building. 

Requirements, and detailed means of 

satisfying them, are given in the documents 

listed below. 

Passivent Technical Services Team can also 

provide advice and guidance on ventilation 

and regulatory compliance. 

England and Wales 

Approved Document F Means of ventilation 

(2006). 

For guidance, please refer to: 

Scotland 

Building (Scotland) Regulations 2004, 

Technical Handbook Domestic Section 3 

Environment (2007). 

Northern Ireland 

Building Regulations (Northern Ireland) 

Technical Booklet K Ventilation (1998). 

Republic of Ireland 

Building Regulations Technical Guidance 

Documents, Part F Ventilation (2002). 

Associated regulations 

The building regulations for energy 

conservation also require control of air 

leakage rates through the building fabric 

(England and Wales Part L) and provision of 

an air supply for fuel-burning appliances 

(combustion air, England and Wales Part J). 

...................................................................

EXTRACT 

VENTILATION 

SYSTEMS 

................................ 

Passive Stack Ventilation (PSV) 11-15 

PSV Whole-House 12 

PSV Single-Stack 13 

Mechanical Extract Ventilation (MEV) 16-23 

Passivent MEV 18 

Passivent iMEV 19 

Passivent AV 20-21 

Passivent Flair 22-23 

Positive Input Ventilation (PIV) 24-25 

............................... 9

10 

......................... 

EXTRACT VENTILATION SYSTEMS 

......................... 

................................................................... 


Passivent have ventilation systems tailored for all types of domestic applications and to meet 

the requirements of building regulations. 

Passive Stack Ventilation (PSV) see pages 11-15 

(System 2) 

Applications: Public and private housing, primarily for individual 


New-build, major refurbishment 

Main features: Continuous demand controlled ventilation, silent operation, 

no energy consumed 

Mechanical Extract Ventilation (MEV) see pages 16-23 

(System 3) 

Applications: Public and private housing. Houses, flats, 

multi-occupancy buildings such as nursing homes, 


New-build, major or minor refurbishment 

Main features: Single central fan connected to multiple extracts, 

continuous low-level ventilation, quiet operation 

Positive Input Ventilation (PIV) see pages 24-25 

Applications: Public and private housing. Houses, flats. 


Main features: Ductless system, easy to install. 

...................................................................

.......................................... 


.......................................... 

..................................................................................................... 

PASSIVE STACK VENTILATION (PSV) 


System 2 

The PSV principle 

Passive stack ventilation (PSV) is driven 

primarily by the natural stack or convection 

effect by which warm air rises. 

Moisture-laden air is extracted directly from 

wet rooms (kitchens, bathrooms etc) 

through ducting up to a roof terminal where 

it is vented to the outside. The air inside a 

house is almost always warmer than that 

outside, and so rises up the duct by natural 

convection, carrying moisture with it. Wind 

blowing across the roof provides additional 

suction (the venturi effect). 

Warm moist air inside 

Colder air outside 

Moisture-laden warm air rises up 

duct and is exhausted through 

roof terminal 

................................................................................................... 11

.......................................... 

12 


................................................ 

............................................................................................................ 


PSV WHOLE-HOUSE 

A PSV Whole-House system ventilates all the 

rooms in a property effectively, using the 

concept of planned air routes to ensure a 

fresh healthy environment. 

Planned air routes 

Moisture is extracted at source from wet 

rooms (kitchens, bathrooms etc). 

Air inlets located in dry rooms (living rooms, 

bedrooms etc) provide a flow of replacement 

fresh air into the building. 

The siting of the inlets and extracts ensures 

that air always moves from dry rooms to wet 

rooms, so that moisture is removed and the 

whole house is ventilated. 

Applications 

Suitable for both new-build and 

refurbishment in private and social housing. 

Primarily designed for individual houses and 

low-rise flats and apartments. 

Demand control 

Ventilation is controlled by ‘intelligent’ inlets 

and extracts which respond automatically to 

changes in relative humidity, thereby 

modulating the ventilation rate in each 

room to meet demand. When humidity is 

low the ventilation rate is minimised, 

irrespective of external weather conditions, 

preventing unnecessary heat loss. 

Both inlets and extracts are operated by a set 

of nylon strands which respond to humidity 

levels and regulate the size of the air opening, 

giving greater ventilation when humidity is 

high whilst preventing unnecessary 

ventilation when humidity is low. 

Features and benefits 

● Natural and energy-efficient 

No electrical connection or power source 

is required, so Passivent PSV systems are 

naturally energy-efficient. 

● Continuous operation 

The system provides 24-hour 

condensation control with continuous 

gentle extraction. It operates all day and 

every day as required, combating 

condensation and mould growth. 

● Reduces requirement for background 

ventilation 

Using PSV means fewer tricklevents or 

wall vents are required, when compared to 

using intermittent fans. 

● No noise 

Passivent PSV systems are completely 

silent in operation. 

● Ideal for special needs 

With its automatic response and no 

operating controls, Passivent PSV is ideal 

for special-needs applications. 

● Minimal maintenance 

No mechanical components to go wrong. 

● BBA approved 

Passivent PSV Whole-House systems are 

covered by BBA (British Board of 

Agrément) Certificate No 96/3273. 

● Design service 

Passivent Limited offers a design 

service for PSV systems, see over. 

Typical PSV Whole-House ventilation system 

All air inlets and extracts respond automatically 

to relative humidity in rooms. Air movement 

is from dry to wet rooms. 

Building regulations 

Passivent systems can be used to satisfy 

building regulations requirements 

throughout the UK and the Republic of 

Ireland for extract and whole-house 

ventilation for domestic and domestic-type 

properties 

See also the general introduction page 8. 

More information is available on request. 

Passivent systems also meet the regulatory 

requirements for security, avoiding draughts 

and preventing rain ingress. 

Bedroom with air inlet 

Living room with air inlet 

Bathroom 

with air 

extract 

Separate roof 

terminal for each 

stack 

Kitchen with air extract 

.........................................................................................................

......................................................................................... 

.......................................................................................... 

PSV SINGLE-STACK 

As a quiet alternative to an individual room 

extract fan, PSV Single-Stack systems can be 

installed to ventilate individual en-suites or 

bathrooms. 

They operate by the same natural stack effect 

as PSV Whole-House systems, and hence 

represent a superior alternative to a fan. 

They provide the same benefits of demand 

control, continuous operation and energy 

efficiency as PSV Whole-House systems, and 

are easy to install. 

Typical PSV Single-Stack system 

Extract responds automatically 

to relative humidity. 

Individual or 

en-suite bathroom 

with air extract 

Applications 

Suitable for both new-build and 

refurbishment in private and social housing. 

Particularly useful as a low-cost 

refurbishment installation in social housing. 

Roof terminal 

........................................................................................... 

13

.......................................... 

14 


................................................ 

............................................................................................................ 


SYSTEM DESIGN AND INSTALLATION 

Design of a system for an individual property 

is quite simple using our online design and 

quotation web site at www.passivent.com . 

Alternatively Passivent Limited offers a 

design service for PSV systems, based on 

building drawings supplied. 

A full installation guide is supplied with 

every Passivent PSV system. 

Typical layout (schematic) 

Actual installations may differ in detail. Follow the 

design layout if one is provided. 

Terminals must be no more than 0.5 metre 

down from the ridge. 

Each duct must run to a separate terminal 

Ducts must rise vertically or near-vertically, 

preferably not more than 45° from vertical 

with a maximum of 2 no. bends 

Use insulated 

ducting in the roof 

void and other unheated 

spaces 

Bedroom Bathroom 

Site air inlets in ‘dry’ rooms 

(living rooms, bedrooms etc) 

Site each air 

extract in a 

‘wet’ room 

(kitchen, 

bathroom) 

Air flow from ‘dry’ to ‘wet’ rooms 

Living room 

There is usually sufficient air flow around internal doors 

to provide replacement air. If this is insufficient a door 

undercut of 10mm or an air transfer door grille should be 

used. 

No electrical connections are required. 

The main features of a typical installation 

with the points which must be observed are 

shown below. 

For simplicity of design and ordering, a 

number of standard stack kits are available. 

Ordering 

To order Passivent-designed PSV systems 

simply state the quotation number and plot 

or plots required followed by the ridge or tile 

manufacturer, make and colour. For selfdesigned 

PSV systems simply quote the stack 

kit reference and quantity of each required, 

followed by the ridge or tile manufacturer, 

make and colour, and the inlet type and 

quantity required. 

Support 

flexible 

ducting every 

300mm to a wire 

or timber batten to 

prevent sagging 

Within the building, run circular 

ducting in a room corner or inside a 

fitted cupboard or wardrobe. 

Alternatively run flat channel ducting 

within a stud partition 

Kitchen 

System components 

Standard stack kits are available as shown. 

Where these are not suitable, alternative 

configurations can be supplied. Extension 

ducting is also available for properties over 

two storeys. 

For individual components (air inlets, 

terminals, ducting) see the Components 

section page 58. 

Code Description 

A161 Humidity-sensitive extract 

F12513 Uninsulated flexible ducting, 3.0m 

F12524 Insulated flexible ducting, 4.0m 

FCA3 Flat channel straight connector 

FCA4 Flat channel circular connector 

FCA6 Flat channel circular adaptor 

FCA10 Flat channel elbow connector 

FCA11 Round pipe 

FCD1 Flat channel ducting, 1.5m 

MC01 Sleeve coupling, male 125mm 

PRT Ridge terminal 

TT7 In-Line tile/slate terminal 

TT9 Tile terminal 

X332 Speed clamp 

..........................................................................................................

......................................................................................... 

........................................................................................... 

PSV 01 Kit 

Typical ground floor kitchen: 

Flat ducting, ridge terminal. 

PRT 

X332 

F12524 

X332 

FCA4 

FCA6 

FCD1 

FCA3 

FCD1 

FCA6 

A161 

PSV 05 Kit 

Typical first floor bathroom: 

Ridge terminal. 

PRT 

X332 

F12524 

X332 

A161 

PSV 06 Kit 


Tile terminal. 

TT9 

X332 

F12524 

X332 

A161 

PSV 02 Kit 


Circular ducting, ridge terminal. 

PRT 

X332 

F12524 

A161 

PSV 03 Kit 


Circular ducting, tile terminal. 

X332 X332 X332 

MC01 

X332 X332 

F12513 

X332 

PSV 07 Kit 


Wall extract, flat ducting, tile 

terminal. 

TT9 

X332 

F12524 

X332 

FCA4 

FCA6 

FCD1 

FCA3 

FCD1 

FCA10 

A161 

FCA11 

TT9 PRT 

X332 X332 

F12513 

X332 

A161 

PSV 04 Kit 

F12524 F12524 

MC01 

PSV 08 Kit 


Flat ducting, tile terminal. 

TT9 

X332 

F12524 

X332 

FCA4 

FCA6 

FCD1 

FCA3 

FCD1 

FCA6 

A161 


Wall extract, flat ducting, ridge 

terminal. 

Specification clause 

Select options required, 

and insert information 

where necessary. 

Passivent PSV Whole- 

House ventilation system 

Provide a BBA-Certificated 

ventilation system 

complying with Building 

Regulations (England and 

Wales) Approved 

Document F OR Building 

(Scotland) Regulations 

Technical Handbook 

Domestic Section 3 OR 

Building Regulations 

(Northern Ireland) 

Technical Booklet K OR 


(Republic of Ireland) 

Technical Guidance 

Documents Part F, by 

means of a whole-house 

passive stack ventilation 

(PSV) automatic system 

comprising: 

Humidity-sensitive 

wall/window inlet vents 

operating between 47% 

and 65% relative humidity, 

sited in habitable rooms as 

required. Humiditysensitive 

ceiling extracts 


and 75% relative humidity 

sited in kitchen, bathroom, 

utility room and WC; each 

extract to be ducted 

separately to a roof 

terminal matching and 

forming an integral part of 

the ridge, or to pitched roof 

tile/slate terminals sited no 

lower than 0.5 metres 

down from the ridge. 

Ridge terminals to have an 

air flow resistance not 

exceeding 10Pa at an air 

movement rate of 100m 2 /h. 

Tile/slate terminals to have 

an air flow resistance not 

exceeding 5Pa at an air 

movement rate of 

100m 2 /h. All terminals to 

provide insect and weather 

protection, and be 

designed to ensure any 

condensate forming will 

run off on to the roof. All 

ducting in roof spaces and 

other unheated spaces to 

be fully insulated with 

25mm insulation. 

The system to be Passivent 

PSV Whole-House system 

covered by BBA Certificate 

96/3273, supplied by 

Passivent Limited, 

2 Brooklands Road, Sale, 

Cheshire M33 3SS. 

Telephone: 0161 962 7113, 

fax: 0161 969 5346, 

email: info@passivent.com. 

Installation to be in 

accordance with the 

manufacturer’s 

instructions, and to be 

carried out by a Passivent 

Mastercare trained 

installer holding a current 

certificate. 

Layout and installation 

must comply with any 

design recommendations 

supplied. 

.......................................................................................................... 

FCA4 

FCA6 

FCD1 

FCA3 

FCD1 

FCA10 

A161 

FCA11 

PSV 09 Kit 


In-Line tile/slate terminal. 

Not suitable for kitchens. 

TT7 

X332 

F12524 

X332 

A161 

15

.......................................... 

16 


................................................ 

............................................................................................................ 

MECHANICAL EXTRACT VENTILATION (MEV) 

MECHANICAL EXTRACT VENTILATION 

(MEV) 

System 3 

Passivent MEV systems 

Passivent Mechanical Extract Ventilation 

(MEV) systems provide continuous 

mechanical extraction at a low rate, 

boostable (manually or automatically) to 

extract at a higher rate when required. 

Whole-house systems comprise a remotely 

located central extract fan connected by 

ducting to extracts in wet rooms (kitchen, 

bathrooms etc), with air inlets located in dry 

rooms only (eg living rooms, dining rooms, 

bedrooms). 

Planned air paths 

Moisture is extracted at source from wet 

rooms. Air inlets located in dry rooms 

provide a flow of replacement fresh air into 

the building. The siting of the inlets and 

extracts ensures that air always moves from 

dry rooms to wet rooms, so that moisture 

and other pollutants are removed at source 

and the whole building is ventilated. 

Air extracts 

located in wet 

rooms 

MEV Systems 

Passivent has a range of MEV systems 

which can be matched to the intended 

application. 

Passivent MEV 

Continuous extract system with boost, 

automatic or manual, provided by extracts. 

Primarily individual systems for houses 

and apartments. 

Passivent iMEV 

Continuous extract system with boost 

provided by automatic humidity-sensitive 

control of fan speed and extracts. Provides 

individual room control automatically. 

Passivent AV 

Continuous extract system with boost, 

automatic or manual, provided by extracts. 

Primarily multiple systems for apartments 

and multi-occupancy applications. 

Passivent Flair 

Continuous extract system for new-build 

apartments, integrating the latest design 

in cooker hoods. 

Air is exhausted 

through roof (or 

wall) terminals 

Low-power continuouslyrunning 

central extract fan located in 

loft space (or cupboard) 

Extract ducts may serve 

a number of rooms 

..........................................................................................................

.......................................................................................................... 

........................................................................................................ 

Applications 

MEV systems are suitable for a wide range of 

applications including houses, apartments 

and multi-occupancy buildings such as 

nursing homes, student accommodation and 

hotels. 

In flats and apartments MEV systems can be 

designed to ventilate either an individual 

apartment or several apartments 

simultaneously. 

Systems are suitable for both new build and 

refurbishment. 


● Tailored systems 

The range of extracts enables systems to 

be tailored specifically to suit individual 

room applications. 

● Demand control 

Humidity-sensitive system, with 

automatic boost to meet greater demand 

when required, provides greater comfort 

and energy efficiency. 

● Planned air movement 

The positions of inlets and extracts ensure 

that air always moves from dry rooms to 

wet rooms, where it is extracted. 

● Continuous extraction with boost 

Continuous gentle extraction at all times; 

the system operates all day and every day, 

boosting as required. 

● No noise problems 

The fan is normally installed in the roof 

space or a cupboard to avoid noise 

problems. 

● Ideal for special needs 

Automatic iMEV option ideal for special 

needs, with no manual control required. 

● Energy-efficient, low maintenance 

Fans have a low energy consumption, and 

minimal maintenance is required. 

● Simple installation 

Requirement for background ventilation 

(air inlets) is significantly reduced 

compared with intermittent extract fans. 

● Design service 

Passivent Limited offer a design service for 

MEV systems. 

Building Regulations and energy 

performance 

The Government’s Standard Assessment 

Procedure (SAP) is the method for 

calculating the energy rating or performance 

of dwellings to comply with Building 

Regulations. Registered SAP assessors use a 

computer program to calculate 

- the SAP rating 

- the Target CO2 Emission Rate (TER) based 

on standard values for a dwelling of the same 

size and shape, and 

- the Dwelling CO2 Emission Rate (DER), 

based on the performance values for the 

actual dwelling being assessed. 

For compliance, the DER must be no worse 

than the TER. 

Appendix Q of the SAP allows the use of 

actual performance data derived from 

independent assessments of systems, in place 

of default values. For energy efficient 

systems such as Passivent MEV this method 

can provide an enhanced SAP rating. 

The A151DC fan used in the Passivent MEV 

system is included on the Appendix Q web 

site. 

System design 

Passivent offer a design service for our MEV 

systems, based on building drawings 

supplied. 

Initially an outline proposal and estimate for 

a system will be prepared; following 

acceptance of this, a full design and costing 

will be prepared. 

System installation 

A full installation guide is supplied with each 

mechanical extract ventilation system. 

.......................................................................................................... 

17

18 

......................... 


......................................... 

.................................................................................... 

PASSIVENT MEV 

Description 

Extraction is driven by a single low-power 

consumption DC fan. This is normally 

installed in the roof space or a cupboard and 

mounted to avoid noise disturbance. Fans 

operate efficiently at all times whether vents 

are fully open or virtually closed. 

Extraction can be boosted by a control 

switch, which shows the user via an LED 

display, the level at which the fan is 

operating. 

BBA approved 

Passivent MEV Whole-House systems are 

covered by BBA (British Board of Agrément) 

Certificate No 96/3273. 


Extract fan A151DC 

Low-wattage DC continuously-running fan, 

specially designed for efficient extraction of 

air along lengthy ducts. 

Extract 

A125 extracts located in ‘wet’ rooms. 

Other components 

For air inlets, terminals, and ducting, see the 

Components section on page 58. 

Typical MEV Whole-House ventilation systems 

Air movement is from ‘dry’ to ‘wet’ rooms 

Individual house Apartments: individual systems 

Bathroom 

Extract fan 

Kitchen 



system. 

Extract fan 

Extract fan 

Kitchen 

Bathroom 

Kitchen Bathroom 

....................................................................................

......................... 

......................... 

.................................................................... 

PASSIVENT iMEV 

Description 

Innovative and intelligent, iMEV is a totally 

new concept in central mechanical extract 

ventilation. The system automatically 

provides, without any occupant involvement, 

individual room control, and is eminently 

suitable for both houses and apartments. 

The low-energy DC central extract fan 

incorporates a humidity sensor linked to a 

microprocessor that continuously monitors 

the relative humidity of the extracted air. 

The fan is linked via ducting to humidity 

responsive extracts located in the ‘wet’ 

rooms. These open and close in response to 

relative humidity. Sensing increasing 

humidity the processor will progressively 

boost the fan. 

Therefore when relative humidity increases 

in that room: 

1. the extract in that room will open 

2. the humidity of the exhaust air will 

increase 

3. the fan speed will increase 

4. thus boosting the extract rate from the 

room containing the open extract. 

As humidity is reduced the extract will close 

and the fan will slow down to its normal 

running setting, until relative humidity in a 

wet room increases again. 

Typical iMEV Whole-House ventilation systems 



Extract fan A151DCH 

Low energy central extract fan containing 

integral humidity sensor and 

microprocessor. Progressively boosts extract 

rate in response to increasing levels of 

relative humidity in the extracted air. 

Extracts 

A121 humidity 

sensitive extracts 

located in ‘wet’ rooms 

respond automatically 

to changes in relative 

humidity, opening and closing to meet 

demand, working in harmony with the fan to 

boost individual room extraction. 


For air inlets, terminals, and ducting, see the 

Components section on page 58. 



system. 

Individual house Apartments: individual systems 

Bathroom 

Extract fan 

Kitchen 

Extract fan 

Extract fan 

................................................................... 

Kitchen 

Bathroom 


19

20 

......................... 


................................................ 

........................................................................................... 

PASSIVENT AV 

Description 

Extraction ventilation is driven by a 

continuously-running central DC extract fan 

connected to extracts located in the ‘wet’ 

rooms. Ventilation is boosted by the wider 

opening of the extracts, which can provide 

either automatic or manual boosts. 

Passivent AV is eminently suitable for 

apartments, where a single system can 

ventilate several apartments, and for student 

accommodation, hotels and care and nursing 

homes. 

The system is specially designed for efficient 

extraction of low volumes of air along 

lengthy ducts. 

The use of one system for several dwellings 

can reduce running costs and energy 

consumption per dwelling. It also minimises 

the number of roof penetrations required. 

BBA approved 

Passivent AV Whole-House systems are 

covered by BBA (British Board of Agrément) 

Certificate No 96/3273. 


Extract fan A151DC 

Low-wattage DC central extract fan for 

efficient extraction of air along lengthy duct 

runs. 

Extracts 

All extracts are for ceiling or wall-mounting 

in wet rooms. Boost is provided by wider 

opening of the vents, controlled as shown 

below. 

● Humidity-sensitive extracts respond to 

room humidity automatically. 

● Timed electrical boost is activated 

manually and operates for a preset time. 

● Constant volume extracts are selfregulating 

to maintain a constant extract 

rate. 

● PIR (passive infrared) boost is activated 

when a person is detected in the room, 

and operates for a preset time. 

The range of extracts enables the whole 

design and ventilation strategy to be tailored 

to individual room requirements and use. 


For air inlets, terminals, ducting, see the 

Components section page 58. 

Typical AV Whole-House ventilation systems 

Apartments: multiple system 

Multi-occupancy: nursing homes, student accomodation, hotels etc 

Bedroom 

Bedroom 

Extract fan 

........................................................................................... 

Kitchen 

Bathroom 


Extract fan 

Ensuite 

bathroom 

Ensuite 

bathroom 

Corridor 

Corridor

......................................................................................... 

........................................................................................... 

........................................................................................... 





Passivent MEV/iMEV/AV 


Provide a ventilation 

system complying with 


(England and Wales) 

Approved Document F 

OR Building (Scotland) 

Regulations Technical 

Handbook Domestic 

Section 3 OR Building 

Regulations (Northern 

Ireland) Technical Booklet 

K OR Building Regulations 




means of a mechanical 

extract ventilation system 

comprising: 

Humidity-sensitive 

wall/window inlet vents 


and 65% relative 

humidity, sited in 

habitable rooms as 

required. 

Ceiling extracts sited in 

kitchen, bathroom, utility 

room and WC … , and 

ducted to a central fan. 

Central extract fan ducted 

a roof terminal. 

All ducting in roof spaces 

and other unheated spaces 

to be fully insulated with 

25mm insulation. 

The system to be 

Passivent MEV/iMEV/AV 


supplied by Passivent 

Limited, 



Telephone: 0161 962 7113, 

fax: 0161 969 5346, 









certificate. 

21

Typical Flair system for 

an apartment 

22 

......................... 


................................................ 

........................................................................................... 

PASSIVENT FLAIR 

Description 

Passivent Flair is an innovative and 

extremely quiet extract ventilation system 

for new-build apartments. Aesthetically 

pleasing and discreet, it ensures a fresh, 

clean and healthy internal environment 

throughout an apartment with low energy 

consumption. 

The system ventilates the kitchen, 

bathrooms (which may be ensuite) and WCs. 

Elegant kitchen cooker hoods and discreet 

bathroom extracts are linked to a low-noise, 

low-energy central extract fan. 

Self-regulating extracts operate constantly to 

keep the bathroom and ensuite ventilation at 

its planned level. In the kitchen, increased 

extraction when cooking is provided by the 

boost switches on the cooker hood. 

Cooker hoods 


● Efficient ventilation 

Provides ventilation where it is most 

needed - kitchen and bathrooms. 

● Quiet and effective 

Quieter and more effective than individual 

room extract fans. Central extract fan can 

be located discreetly in a cupboard. 

● Aesthetically attractive 

Elegant Italian-designed cooker hoods in 

stainless steel, with height-adjustable duct 

and dishwasher-proof grease filter for easy 

cleaning. Attractive wall- or ceilingmounted 

bathroom extracts. 

● Single outlet 

Single wall or roof outlet minimises façade 

disruption. 

S2 Roma S5 Siena 

S7 Napoli 

...........................................................................................

......................................................................................... 

.......................................................................................... 

Cooker hood dimensions (mm) 


Central extract fan 

Low-wattage continuously-running fan. 

S125 - spigot diameter 125mm 

S150 - spigot diameter 150mm 

Code & description Height 

(min - max) 

Width Depth 

S2 Roma 710 - 1130 600, 900 500 

S5 Siena 780 - 1130 600, 900 500 

S7 Napoli 710 - 1130 600, 900, 1000, 1200 500 

S10 Ancona 780 - 1130 600, 900 500 

S11 Verona 850 - 1270 900 600 width 

S10 Ancona S11 Verona 

Extracts 

Ceiling-mounted constant volume extracts 

are self-regulating to maintain a constant 

extract rate, and are sized to suit the 

bathroom or ensuite. 

Extract code Airflow at 80Pa 

SRE/15 15m3 /h (4.2 l/s) 

SRE/30 30m3 /h (8.4 l/s) 

SRE/45 45m3 /h (12.6 l/s) 

SRE/60 60m3 /h (16.8 l/s) 

SRE/90 90m3 /h (25.2 l/s) 

Terminals, Ducting 

Refer to the Components section page 58. 



system. 

........................................................................................... 

height 

depth 





Passivent Flair 


Provide a ventilation 

system complying with 



Approved Document F 

OR Building (Scotland) 










means of a mechanical 

extract ventilation system 

comprising: 

Self-regulating extracts 

sited in bathroom[s] and 

WC, ducted to a central 

fan 

Cooker hood ….. [insert 

code] sited in kitchen and 

ducted to the fan. 

Central extract fan … 

ducted to a wall/roof 

terminal. 

Continuously running 

central extract fan sited 

… and ducted to a wall 

terminal. 

All ducting in unheated 

spaces to be fully 

insulated with 25mm 

insulation. 

The system to be 

Passivent Flair system 

supplied by 

Passivent Limited, 



Telephone: 0161 962 7113, 

fax: 0161 969 5346, 









certificate. 

23

24 

......................... 


................................................ 

........................................................................................... 

POSITIVE INPUT VENTILATION (PIV) 

Passivent PIV system 

Positive Input Ventilation uses air 

displacement to ventilate a whole dwelling, 

thereby improving indoor air quality and 

stopping or preventing condensation 

problems from occuring. Predominantly 

designed for installation in existing 

properties, the PIV units are very easy to 

install. 

A single fan unit mounted in the roof space 

(or central location for flats) supplies fresh 

filtered air into the dwelling via a central 

hallway or landing. This creates a slight 

positive air pressure which forces stale 

vapour-laden air out via fortuitous air gaps 

or through humidity-sensitive window vents. 

Whole-house system 

Eaves ventilation to roof space 

provides fresh air supply 

Air exhausted through 

window vents 

Continuous-running fan 

draws air from the roof space 

and supplies it to the dwelling 

Bedroom 

Living room 

PIV unit 

The PIV unit comprises a fan with connector 

duct and ceiling diffuser. The fan runs 

continuously unless the loft temperature 

exceeds 25ºC, when the unit will switch off. 

Above this temperature the hot incoming air 

would be uncomfortable for the occupants 

and the risks of condensation are somewhat 

reduced. When the temperature falls below 

25ºC the unit will automatically switch itself 

back on. At temperatures between 19ºC and 

25ºC the unit operates in heat recovery mode 

harnessing the benefits of solar gains, 

whereby the air in the loft is warmer than 

outside air. 

The ceiling diffuser has been 

aerodynamically designed to direct incoming 

air along the ceiling (coanda effect) where it 

mixes with warm buoyant air before recirculating 

downwards, thereby ensuring a 

more even thermal gradient between the 

floor and ceiling. 

Solar gain 

Bathroom 

........................................................................................... 

Kitchen

......................................................................................... 

........................................................................................... 

Applications 

Due to its ease of installation, PIV is 

designed primarily for the refurbishment of 



● Energy savings 

Supply air taken from the roof space is 

slightly warmer than outside air, so can 

provide some energy saving compared 

with a conventional extract system. 

● Simple and easy installation 

Requires only a single electrical 

connection. Does not require ducting 

through the interior spaces. 

● Low running costs 

With its DC fan, the PIV system is 

extremely energy-efficient, costing from as 

little as a penny a day to run. 

● Elapsed time meter 

Shows total run time, providing landlords 

with a foolproof check to prove usage. 

● Minimal maintenance 

Replacement of the long-life filter is only 

required every 5 years. 

● Aerodynamically designed diffuser 

The diffuser is designed to direct incoming 

air along the ceiling, thereby mixing with, 

re-using and re-circulating high level 

warm air. 

Quotation 

Passivent offer full advice and guidance for 

PIV systems, and will prepare an estimate 

and specification. 



system. 

The ceiling must be as airtight as possible to 

minimise recirculation of air from within 

the dwelling. 

Roof space must be ventilated from outside, 

eg by eaves vents. 

Energy performance 

The Passivent PIV loft unit incorporates an extremely low wattage DC motor minimising 

energy usage. 

Incoming Ventilation Air volume Airflow Power Outlet noise 

air temp mode setting (l/s) consumption dBA at 1 metre 

(fan speed) (W) 

25ºC Comfort 1 0 0 - 

2 0 0 - 

3 0 0 - 

4 0 0 - 

.......................................................................................... 


PIV Unit 

Provide a loft mounted 

positive input ventilation 

system (Passivent 

PIVROOF) comprising a 

DC fan unit, ducting and 

ceiling diffuser. The fan 

unit to have 4 air volume 

settings, incorporate an 

elapsed time meter and 

have a one piece long life 

filter. System to switch to 

condensation control mode 

at loft temperatures below 

19ºC, heat recovery mode 

between 19ºC and 25ºC and 

comfort mode above 25ºC. 

PIV system to be supplied 

by Passivent Ltd, 

2 Brooklands Road, 

Sale, Cheshire M33 3SS, 

Telephone: 0161 962 7113 

Fax: 0161 905 2085 

Email :info@passivent.com 

25

26 

......................... 

......................... 

...................................................................

BACKGROUND 

VENTILATION 

................................ 

Introduction 28-29 


Fresh wall vents 42-44 

.............................. 27

.......................................... 

28 

BACKGROUND VENTILATION 

................................................ 

............................................................................................................ 


Background ventilation is provided by 

means of a fixed performance background 

ventilator providing controllable ventilation 

to rooms or spaces at a relatively low rate. 

Passivent range 

Passivent have a comprehensive range of 

non-mechanical window and wall vents 

(Tricklevents and Fresh vents) to meet most 

requirements. 

They are purpose designed and offer the 

advantages of being controllable, secure, and 

designed to avoid draughts. 

A wide range of acoustic models is also 

available, see pages 45-53. 

Applications 

Passivent ventilators are suitable for both 

new-build and refurbishment in domestic 

applications, both private and public sector. 

They can be used as part of a domestic 

ventilation system comprising background 

ventilators and intermittent extract fans 

(Approved Document F System 1), PSV 

(System 2) and MEV (System 3). 


● Easily controlled 

Most models allow occupant control, 

leading to greater satisfaction with 

comfort levels. Automatic humiditycontrolled 

models are also available. 

● Efficient in operation 

Effective ventilation is provided at all 

times. 

● Protection 

Vents are specifically designed to provide 

security, adjustability, avoidance of 

discomfort due to cold draughts, and 

prevention of rain ingress. 

● Acoustic range 

Acoustic range wall vents provide good 

sound insulation for noisy locations (see 

next section). 

● Colour service 

The design requirements of architects and 

developers are increasing the demand for 

coloured window frames together with 

matching coloured window vents, 

particularly within inner city developments. 

Passivent are able to offer a service by 

which many of our plastic and aluminium 

window vents can be coated in any RAL 

colour to match windows. 

Building regulations requirements 

All ventilators can be used to meet the 

background ventilation requirements of 

building regulations throughout the UK and 

the Republic of Ireland, as part of a suitably 

designed ventilation system or strategy. 

For more information see Building 

Regulations on page 8 (general introduction) 

see the table opposite. 

Ventilation area measurement 

For purposes of building regulations, 

ventilation opening size is defined in terms 

of ‘equivalent area’ (England and Wales) or 

‘free area’ (remainder of UK and Ireland). 

‘Free area’ is simply the size of the 

ventilation aperture, whereas ‘Equivalent 

area’ provides a measure of the actual 

aerodynamic or air flow performance of a 

given ventilator. 

Equivalent area of background ventilator 

openings is measured by the method of 

BS EN 13141-1: 2004 ‘Ventilation for 

buildings - Performance testing of 

components/products for residential 

ventilation - Part 1: Externally and internally 

mounted air transfer devices’. 

Background ventilators for use in 

conjunction with continuous mechanical 

extracts (System 3) 

The need for background ventilators will 

depend on the air permeability of the 

dwelling, and this is not normally known at 

the design stage. Therefore, as a precaution, 

it is recommended that controllable 

background ventilators having a minimum 

equivalent area of 2,500mm 2 are fitted in 

each room, except wet rooms from which air 

is extracted. Where this approach causes 

difficulties (eg on a noisy site) please contact 

our technical department for advice. 

Replacement windows 

Where windows being replaced are fitted 

with trickle vents, then the replacement 

windows should also be fitted with them. 

However, with the reduction in fortuitous 

ventilation due to improved 

weatherstripping of new windows, it would 

be good practice to fit trickle vents on all 

replacement windows. 

System design 

Passivent offer guidance and a design service 

for background ventilation schemes based on 

the appropriate design process and 

information provided by the client. The 

design will achieve regulatory compliance, 

and will list the ventilation components 

required. 

However it remains the responsibility of the 

client or his advisor to verify the design's 

suitability for the project. 

..........................................................................................................

......................................................................................... 

........................................................................................... 

PRODUCT RANGE 

Passivent window and through-wall ventilators 

Vent type Ventilation opening (mm 2 ) Features Page 

free area equivalent area 

Window vents (Tricklevents) 

Through-frame 

Delta Vent and Grille 2000, 4000 1310, 2800 BBA Certificated 30 

Slimfit Vent and Grille 4000 2500 Very slim, suitable for factory fitting 31 

Frame Vent and Canopy Grille 2000, 4000 1400, 3120 BBA Certificated 32-33 

Ultra Vent and Grille 4000 3600 Slim profile, integral weatherseal 34 

Energy Saver Vent 4000 2760 Humidity-sensitive 35 

Over frame and over glass vents 

Streamline Overhead Vent 4000 - 8000* 2500 - 5000* BBA Certificated 36-37 

Overglass Vent Bars 2000 - 8000 1310 - 5930 For double or single glazing 38-39 

Superglaze vent 2000 - 8000* 1250 - 4390* BBA Certificated. For double glazing 40-41 

Wall vents (Fresh) 

Fresh 80 4000 2220 Dust and insect filter 42-44 



Fresh 99H 6000 3350 Humidity-sensitive, automatic 42-44 

Fresh TLF 

*depending on window width 

5000 2540 Dust and insect filter. Stylish new design 42-44 

Level of background ventilation required for use in conjunction with intermittent extract fans (System 1) 

Equivalent ventilator area* for dwellings (mm 2 ) 

Number of bedrooms** 

Total floor area (m2 ) 1 2 3 4 5 

100 Add 5,000mm2 for every additional 10m2 floor area 

*The equivalent area should be determined at a 1Pa pressure difference using the appropriate method (BS EN 13141-1). 

**This is based on two occupants in the main bedroom and one occupant in all other bedrooms. For a greater level of 

occupancy, assume greater number of bedrooms (ie assume an extra bedroom per additional person). For more than 

five bedrooms, add an additional 10,000mm2 per bedroom. 

........................................................................................... 

29





Provide background 

ventilation complying 

with Building 

Regulations (England and 

Wales) Approved 

Document F OR Building 

(Scotland) Regulations 

Technical Handbook 

Domestic Section 3 OR 


(Northern Ireland) 

Technical Booklet K OR 





means of internal 

window ventilators giving 

*2000 / 4000mm2 free 

area or *1310 / 2800mm2 equivalent area of 

ventilation (Passivent 

Delta Vent *TVDV2 / 

TVDV4), and external 

grille (Passivent Delta 

Grille *TVDG2 / TVDG4) 

of injection-moulded 

plastic. Ventilators to 

provide upward 

directional airflow, have 

slide button control with 

‘open’ and ‘closed’ 

indication, and optional 

trickle facility. Ventilators 

and grilles to be certified 

by the British Board of 

Agrement (BBA) and to 

meet or exceed the worst 

case requirements of 

BS 6375: Part 1: 2000 for 

resistance to water 

penetration. 

Ventilators and 

information available 

from Passivent Ltd, 


Cheshire M33 3SS, 

Telephone: 0161 962 

7113, Fax: 0161 905 2085. 

Email: 

info@passivent.com 

*Delete as required. 

30 

......................... 

.................................................................................... 

DELTA VENT AND GRILLE 

CERTIFICATE No. 95/3120 

Controllable internal vent, with matching 

external grille for weather and insect 

protection. 

Can be used to meet the background 

ventilation requirements of building 

regulations throughout the UK and the 

Republic of Ireland, as part of a suitably 

designed ventilation system or strategy, and 

also the requirements for security, adjustability, 

avoidance of discomfort due to cold draughts 

and prevention of rain ingress. 

For more information see Building Regulations 

on page 8. 


● Directs inward air flow upwards. 

Avoids draughts and discomfort, thereby 

encouraging use. 

● Flush fitting slide control with positive 

action marked with open/closed position. 

Clearly indicates when vent is open/ 

closed. No protruding flaps 

to break off. 

Easy to operate. 

Cord 

operator 

to special 

order 


● Meets the worst case requirements of 

BS 6375: Part 1: 2000 for resistance to 

water penetration. 

Weather performance of the windows is 

not impaired by installing vents. 

● Location lugs. 

Ensure vents are quickly and easily 

mounted in the correct position. 

● Trickle facility (removable). 

Provides small amount of ventilation even 

when vent is closed. 

● Optional cord operation. 

For elderly and special needs, 

or where access 

is difficult. 

Ventilation area 

See table. 

......................................... 

Length see table 

Slide control 

Material 

Injection-moulded plastic. 

Colours: white or brown. 

Other RAL colours to special order subject 

to minimum quantities. 

Fixing 

By two screws each for vent and grille, 

concealed by cover caps. 

External 

grille 

Dimensions 

Type code Ventilation opening Trickle Length Slot size 

Vent & grille free area equivalent area ventilation 

TVDV2 & TVDG2 2000mm2 1310mm2 250mm2 190mm 148 x 15mm* 

TVDV4 & TVDG4 4000mm 2 2800mm 2 500mm 2 350mm 308 x 15mm** 

*Alternatives: 160 x 12.5mm square-ended slot with pilot holes drilled for screws; nine holes 17mm diameter. 

**Alternatives: 320 x 12.5mm square-ended slot with pilot holes drilled for screws; eighteen holes 17mm 

diameter; two slots 137 x 15mm with 40mm central blank. 

Depth 

24mm 

Height 

22mm 

control flap 

Internal 

vent 

Installed in window frame 

Installed on Overglass 

Vent Bar 

....................................................................................

.......................................... 


......................................... 

..................................................................................................... 

SLIMFIT VENT AND GRILLE 

Height 

19mm 

The Slimfit is an innovative, stylish, slimprofile 

ventilator, eminently suitable for 

ventilated head sections. 






also the requirements for security, 

adjustability, avoidance of discomfort 

due to cold draughts and prevention of rain 

ingress. 


Regulations on page 8. 


Height 

22mm 


● Slim projection of vent - only 5mm. 

Grille inset. 

Unobtrusive appearance. Suitable for 

factory-fitting to window frames; 

minimises risk of damage in transit. 

● Clip-fit vent and inset grille. 

No screws, thereby speeding up installation, 

reduces window production cost. 

● Integral flange to vent. 

Completely masks routed slot. 


See table. 

Material 

Vent ABS, inset grille polypropylene. 


Fixing 

Clip-in. 

Slimfit inset Grille 

Dimensions 

Type code Ventilation opening Length Slot size 


Vent TVSFV4 4000mm2 2500mm2 420mm 403 x 15mm 

Grille TVSFIG4 173mm *150 x 15mm 

*Two grilles and two slots required per vent. 

Slimfit Vent 







with Building Regulations 


Approved Document F OR 

Building (Scotland) 






K OR Building 

Regulations (Republic of 

Ireland) Technical 

Guidance Documents Part 

F, by means of internal 


4000mm2 free area or 

2500mm2 equivalent area 

of ventilation (Passivent 

Slimfit Vent TVSFV4 and 

inset Grille TVSFIG4). 

Ventilators to be injection 

moulded plastic, to 

project a maximum of 

5mm in closed position. 



from Passivent Limited, 



Telephone: 0161 962 7113, 

Fax: 0161 905 2085. 

Email: info@passivent.com 

................................................................................................... 

31

.......................................... 

..................................................................................................... 

FRAME VENT 


Height 

29.5mm 



Vent Bar 

32 

Depth 22mm 

Controllable internal vent, designed for use 

with external Canopy Grille. 







adjustability, avoidance of discomfort due to 

cold draughts and prevention of rain ingress. 





See table. 

Material 

Aluminium with polyester paint finish to 

BS 6496. End caps and backing plate are 

colour co-ordinated injection-moulded PVC. 

Colours: white or brown. Other colours to 

special order subject to minimum quantities. 



Avoids draughts and discomfort, 

thereby encouraging use. 

● Three settings: open, half open, closed. 

Provides a level of ventilation control. 

● Trickle facility (removable). 

Provides small amount of ventilation even 

when vent is closed. 




Weather performance of the 

windows is not impaired 

by installing 

vents. 

Dimensions 

Type Ventilation opening Trickle Length Suitable grilles Slot size 

code free area equivalent area* ventilation 

TVFV2 2000mm2 1400mm2 250mm2 198mm Canopy Grille TVCG2 148 x 15mm 

TVFV4 4000mm2 3120mm2 500mm2 358mm Canopy Grille TVCG4 308 x 15mm 

* in conjunction with external Canopy Grille 


......................................... 

● Easy to operate. Suitable for all users 

including elderly and special needs. 

● Flap design masks daylight transmission. 

Encourages use. 

● Grille has 2mm rigid mesh plastic insect 

screen. Protects against insect ingress. 

Prolonged life, will not rot or corrode. 

● Backing plate to vent and sealant groove 

to grille. Provide additional protection 

against water penetration 

● Very robust. Ideal for high-abuse areas. 

● British Board of Agrément Certificate no 

95/3120. 

Fixing 

By screws through end caps, concealed by 

clip-on covers. 
















K OR Building 





window ventilators and 

external grilles giving 

*2000 / 4000mm2 free 

area or *1400/3120mm2 equivalent area of 

ventilation. Internal vent 

(Passivent Frame Vent 

*TVFV2 / TVFV4), and 

external grille (Passivent 

Canopy Grille 

*TVCG2/TVCG4) to be of 

aluminium with polyester 

paint finish to BS 6496: 

1984 and fitted with 

colour co-ordinated end 

caps, Additionally the 

internal vent to have a 

back plate, provide upward 

directional airflow, two 

open settings and optional 

trickle facility. External 

grille to incorporate 2mm 

mesh insect screen of 

injection moulded plastic, 

and water-resistant 

sealant groove. Both vent 

and grille to be certified 


Agrément (BBA) and to 

meet the worst case 

requirements of 

BS 6375: Part 1: 2000 for 


penetration. 

Ventilators, grilles and 





Telephone: 0161 962 7113, 

Fax: 0161 905 2085. 


*Delete as required. 

...................................................................................................

.......................................... 

..................................................................................................... 

CANOPY GRILLE 


Height 

30mm 

Depth 

22mm 

External grille designed to give weather and 

insect protection to an internal Frame Vent 

or Energy Saver Vent. 

British Board of Agrément 

Certificate no 95/3120. 

2mm mesh 

insect screen 

Dimensions 


Suitable 

internal 

vent 




water penetration when used with a 

suitable vent. 



● 2mm rigid mesh insect screen of 

injection-moulded plastic. 

Protects against insect ingress. 

Prolonged life, will not rot or corrode. 

● Integral mastic sealant groove. 

Provides additional protection against 


● Very robust construction. 

Ideal for high abuse areas. 



See table. 

Material 


BS 6496. Injection-moulded plastic end caps 

and insect screen. 


Colour co-ordinated end caps. Other colours 

to special order. 

Fixing 

By screws through end lugs. 

Type Ventilation opening Length Suitable vents Slot size 

code free area equivalent area* 

TVCG2 2000mm2 1400mm2 180mm Frame Vent TVFV2 148 x 15mm 

TVCG4 4000mm2 3120mm2 340mm Frame Vent TVFV4 308 x 15mm 

2760mm2 Energy Saver Vent TVES4 See page 37 

TVCG390 4200mm2 2500mm2 390mm TVAL-dB450/40 350 x 12mm 

4200mm2 2012mm2 TVAL-dB800/42 350 x 12mm 

*in conjunction with internal Vent. Other lengths are available to special order. 

......................................... 

The specification clause 

for the canopy grille is 

incorporated in the 

specification of the 

internal vent (TVFV2/4, 

TVES4, TVES4DB, 

TVALDB). 



Vent Bar 

................................................................................................... 

33

.......................................... 

34 


......................................... 

..................................................................................................... 

ULTRA VENT AND GRILLE 

Ultra Grille 

Height 

25mm 

Slim profile internal aluminium vent with 

complementary external grille for aluminium, 

PVC-U and timber window frames. 











Ultra Vent 

Length 285mm 


● Slim profile projects only 11mm. 

Unobtrusive appearance. Suitable for 

factory fitting to window frames; 

minimises risk of damage in transit. 


Avoids draughts and discomfort, 

encouraging use. 

● Integral weatherseal to vent. 

Ensures a weathertight seal between the 

window and the vent. 


See table. 

Material 

Vent and grille: Auminium with polyester 

paint finish to BS6496. Injection-moulded 

plastic end caps. 

Colour: White. Other colours to special 

order. 

Fixing 

By two screws each for vent and grille. 

Length 305mm 
















K OR Building 





window ventilators and 

external grilles giving 



of ventilation. Internal 

vent (Passivent Ultra Vent 

TVUV3) and external grille 

(Passivent Ultra Grille 

TVUG3), to be of 


paint finish to BS6496: 

1984 and fitted with 


caps. Additionally the 

internal vent to provide 

upward directional airflow 

and incorporate an 

integral weatherseal. 

External grille to 

incorporate 2mm mesh 

insect screen, and water- 

resistant sealant groove. 

Vent and grille to meet 

the worst case 

requirements of BS6375: 

Part 1: 2000 for resistance 

to water penetration. 

Ventilators, grilles and 





Telephone: 0161962 7113, 

Fax: 0161905 2085. 

Email:info@passivent.com 

Dimensions 

Type code Ventilation opening Slot size 

Vent & grille free area equivalent area 

TVUV3 & TVUG3 3000mm2 2500mm2 347 x 12mm 

...................................................................................................

........................................... 

..................................................................................................... 

ENERGY SAVER VENT 

Height 

30mm 

Depth 40mm 

The Energy Saver Vent automatically opens 

and closes depending on humidity levels in 

the room, ensuring correct ventilation 

levels are achieved and minimising the 

unnecessary entry of cold air. 

Designed for use with external Canopy Grille. 












Length 402mm 


● Requires no electrical or mechanical 

power supply. 

Even greater energy efficiency compared 

with standard tricklevents. 


See table. 

Airflow at 20Pa: minimum 7m 3 /hr (closed to 

trickle), maximum 40m 3 /hr. 

Operates between the following humidity 

levels: 47% RH 500mm 2 ventilation 

area, 65%RH 4000mm 2 ventilation area. 

Energy Saver Vent 

Fully open Closed 

Material 

Injection moulded polystyrene. 

Colour: white, brown or black. Other RAL 

colours to special order. 

Fixing 

Remove the outer cover, fix the vent to the 

window frame by two screws, refit cover to 

conceal fixings. 

Dimensions 

Type code Ventilation opening Length Suitable grille 


TVES4 4000mm2 2760mm2 402mm Canopy Grille TVCG4 

Slot size: two slots 130 x 15mm with a 10mm blank. 
















K OR Building 




F, by means of automatic 

humidity-controlled 

internal window ventilators 

and external grilles giving 



of ventilation. Internal 

vent (Passivent Energy 

Saver Vent TVES4) to 

operate between 47% and 

65% relative humidity. 

External grille (Passivent 

Canopy Grille TVCG4) of 


paint finish to 

BS6486:1984, having 


caps, incorporating 2mm 

mesh insect screen of 

injection moulded plastic, 

and water-resistant 

sealant groove. 



from Passivent Limited, 



Telephone: 0161 962 7113, 

Fax: 0161 905 2085. 




Vent Bar 

................................................................................................... 

Canopy 

Grille 

.......................................... 

35
















K OR Building 




F, by means of overhead 


*…… mm2 free area or 

*…… mm2 equivalent 

area of ventilation 

(Passivent Streamline 

Overhead Ventilator 

TVSOH). 

Ventilators to be the full 

width of the window and 

to comprise window-grade 

PVC-U with one-piece 

clip-in injection-moulded 

plastic end caps at each 

end, integral full-length 

external canopy with 

PVC-U grille, internal 

canopy incorporating 

horizontal hit-and-miss 

vent with nylon chain 

operation one side, and 

designed to accept 

purpose-made clip-in 

plaster trims to extend 

vent height by 10 or 

15mm. Ventilators to be 

certified by the British 

Board of Agrement (BBA), 

and to meet or exceed the 

worst case requirements 

of BS 6375: Part 1: 2000 

for resistance to water 

penetration. 






Telephone: 0161 962 7113, 

Fax: 0161 905 2085. 


*Insert figures required. 

36 

......................... 

................................................ 

........................................................................................... 

STREAMLINE OVERHEAD VENTILATOR 

Fits directly over the window frame head, 

giving discreet ventilation. 









Ideal for domestic and commercial 

buildings, offices, schools and hospitals. For 

noisy environments, eg beside major roads 

and railways or near airports, an 

acoustically treated version 

is available. 

Plaster trim (optional) 

extends vent height by 

10 or 15mm 

Full length 

external canopy 

with grille 

Positive clip-in end caps 

watertight to 1000Pa 


● Slim profile and neat design. 

Discreet, unobtrusive, appears as an 

integral part of the window frame. 

● Installation above window head is simple, 

requiring no cutting or machining of 

frame. 

Avoids weakening the frame and exposing 

the chambers and reinforcement of hollow 

profiles. 




Weather performance of the windows is not 

impaired by installing vents. 


Suitable for new-build and renovation, and 

for plastic, aluminium or timber windows. 

Permanent open vent option for combustion 

air available (see page 54 for requirements). 

British Board of Agrément 

Certificate no 95/3120. 

Hit and miss 

control 

● Internal hit and miss control with nylon 

chain operation at one side as standard. 

Easily accessible for maintenance. 

Easy control especially for elderly and 

special needs. 

● Design allows for 20mm internal plaster. 

Clip-in plaster trims extend the vent 

height by 10 or 15mm. 

Accommodates thicker plaster, stepped 

lintels, external render and site 

inaccuracies. 

● Full length external canopy. 

Acts as a head drip, improving weather 

protection. 

Length to suit overall 

width of window frame 

...........................................................................................

........................... ..................................................................... 


.... ......................................................... 

31mm 

Alternative 

knob 

control 

To suit window frame 

thickness of 55 to 70mm. 

Other sizes to special 

order. 

15mm 

45mm 

Minimum vent length to provide specified ventilation area 

Side-mounted 

nylon chain 

operation 

Typical installations 

Minimum 31mm 

clearance required above 

window head (plus extra 

for trims if used) 

Vent code Ventilation opening Length 


TVSOH 4000mm2 2500mm2 660mm 

6000mm2 3750mm2 930mm 

8000mm2 5000mm2 Combustion air 

1200mm 

TVSOHCA 5000mm2 3125mm2 795mm 

8000mm2 5000mm2 1200mm 

Ventilation area is normally restricted on larger lengths to prevent over-ventilation. Greater capacities 

can be provided if required. 

Installation with standard lintel Installation with stepped lintel 


See table. 

Material 

Window-grade extruded PVC-U with 

injection-moulded plastic end caps. 

Colours: white or brown as standard. 

Canopies and plaster trims can be finished in 

any RAL colour to order. 

Fixing 

Simply attached to the window head before 

installing the window. 

Dimensions 

Supplied to length to suit individual window 

width. Can be supplied for window frame 

thickness of 55 to 70mm. Other sizes to 

special order. 

When specifying window size, the height 

must be reduced by 31mm minimum to 

accommodate the vent (extra if plaster trims 

are used). 

......................................................................................................... 

37

38 

Width according to 

glazing thickness 

Height 80mm 

......................... 

........................................................................................... 

OVERGLASS VENT BAR: DOUBLE GLAZING 

Installed above the glass within the window 

frame; for 20, 24 or 28mm sealed double 

glazing units. Overglass Vent Bars are 

supplied complete, ready-fitted with a 

Passivent vent and grille from the throughframe 

range (see table opposite). 





designed ventilation system or strategy, 

and also the requirements for security, 

adjustability, avoidance of 

discomfort due to cold 

draughts and 

prevention of rain 

ingress. 

End cap 



● Thermally broken. 

Reduces risk of condensation on vent. 

● Provides modular ventilation areas 

regardless of length. 

Prevents over- or under-ventilation. 



water penetration when fitted with 

suitable vent and grille. 



● Optional cord operation available (Delta 

Vent version only). 

For elderly and special needs, or where 

access is difficult. 


See table. 

With Delta Vent With Energy Saver Vent 

.................................................. 

Frame Vent (for example) 

positioned centrally 

Glazing gasket 

20, 24 or 28mm sealed 

double glazing unit 

Length see Dimensions 

and table 

Thermal 

break 

Delta Vent 

and Grille 

(for example) 

...........................................................................................

......................................................................................... 

.......................................................................................... 

Material 

Extruded aluminium (thermally broken) 

with polyester paint finish to BS 6496. 

Injection-moulded plastic end caps. 

Colours: white, or white internal face with 

black external face to blend with the glazing, 

camouflaging the vent bar. Other RAL 

colours to special order subject to minimum 

quantities. 

Fixing 

Reduce glass height by 68mm to 

accommodate the vent bar. If the window 

frame has a very deep rebate, measure the 

bar against the frame. If supplied as a 

modular length, remove end caps from the 

bar and trim it equally at each end (so that 

the vent remains central) to a length 56mm 

less than the glass width (ie allowing 28mm 

for each end cap). 

Place glazing gasket (supplied) on top edge 

of glass, position one end of vent bar 

accurately and push on to gasket. Trim 

gasket to length of bar, then replace end 

caps. Fit glazing beads over end caps. 

Dimensions 

Supplied either cut to specified lengths, or in 

modular lengths from 450mm upwards in 

150mm increments for cutting on site. 

End caps can be removed to allow bars to be 

trimmed on site if necessary. Overall length 

after trimming (including end caps) should 

be equal to the actual width of the glass. 

Reduce glass height by 68mm to accept the 

bar. 

Suitable vents and grilles, minimum lengths 

For details of vents and grilles see other pages. 

Internal vent External grille Ventilation opening Minimum 

free area equivalent area length* 

Delta Vent TVDV2 Delta Grille TVDG2 2000mm2 1310mm2 275mm 

TVDV4 TVDG4 4000mm2 2800mm2 435mm 

Frame Vent TVFV2 Canopy Grille TVCG2 2000mm2 1400mm2 275mm 

TVFV4 TVCG4 4000mm2 3120mm2 435mm 

Energy Saver TVES4 Canopy Grille TVCG4 4000mm2 2760mm2 Combustion 

497mm** 

Air Vents TVCA5 - TVCA5 5000mm2 - 460mm 

*Minimum trimmed length of vent bar including end caps. 

**Minimum length of vent bar fitted with Energy Saver Vent can be reduced to 450mm by discarding 

end caps and trimming the vent bar shoulders. 

Overglass Vent Bars: Single glazing 

Passivent can also supply non thermally broken Overglass Vent Bars for 4 or 6mm single 

glazing. Similar to the Overglass Vent Bars for double glazing, the bars are supplied readyfitted 

with a Passivent vent and grille from the through-frame range. 

Further information can be supplied on request. 

.......................................................................................... 
















K OR Building 




F, by means of overglass 


a constant *..........mm2 free area or *.......... mm2 equivalent area of 

ventilation irrespective of 

window width (Passivent 

Overglass Vent Bar fitted 

with *......... internal vent 

and *.......... external 

grille). Ventilators to suit 

*.........mm glazing 

thickness, to be of twopiece 

extruded aluminium 

incorporating thermal 

break with polyester paint 

finish to BS 6496: 1984 

and injection-moulded 

plastic end caps having a 

flange to cover cut 

aluminium ends. 

Ventilators to meet or 

exceed the worst case 

requirements of BS 6375: 








Telephone: 0161 962 7113, 

Fax: 0161 905 2085. 


*Insert figures and vent 

codes required. 

39

40 

......................... 


................................................ 

........................................................................................... 

SUPERGLAZE GLAZED-IN VENTILATOR 

Designed for installation above the glass 

within a window frame. 

Suitable for 20, 24 or 28mm sealed double 

glazing units, the vents may be fitted to 

windows when glazing on site, or during 

manufacture. 









British Board of Agrément Certificate no 

95/3120. 

Vent closed 

20, 24 or 28mm sealed 

double glazing unit 

Vent open 


● Provides modular ventilation areas 

regardless of length. 

Prevents over- or under-ventilation. 

Alternatively where higher ventilation 

areas are required the ventilator can be 

supplied with the airflow proportional to 

length. 

● Manufactured from a combination of 

materials for optimum performance. 

External aluminium extrusion is durable 

and UV-stable. Full-length internal 

control flap is also aluminium, for 

strength and rigidity in operation. 

● The internal PVC-U section constitutes a 

thermal break. 

Reduces risk of condensation on vent. 

● Flap directs incoming air upwards to 

prevent draughts and discomfort. 

Encourages use. 






● Optional cord operation available. 

For elderly and special needs, or where 

access is difficult. 

● Aesthetic and neat design. 

Does not spoil the appearance of the 

window. 


See table. 

Material 

External section is extruded aluminium with 

polyester powder coating to BS 6496. 4mm 

slots form an integral insect screen. Internal 

section is extruded PVC-U. 

Internal flap of polyester powder-coated 

extruded aluminium with integral weather 

seal. Injection moulded handle/catch and 

end caps with integral spring mechanism. 

Glazing gasket supplied to suit glazing 

thickness. 

Colours: white on both internal and external 

faces, or white internal face with black 

external face to blend with the glazing, 

camouflaging the vent. RAL colours to 

special order subject to minimum quantities. 

Width according to 

glazing thickness 

Height 82mm 

...........................................................................................

......................................................................................... 

........................................................................................... 

Options 

Combustion air vent: The flap is held in a 

permanently open position by the end caps; 

the external screen slots are 6mm to comply 

with BS 5440 (see pages 54-55). 

Cord operation: For remote operation, or for 

ease of use by elderly and special needs. 

Ventilator flap is operated by cord control 

mechanism in one end cap, the central 

handle/catch being omitted. 

Integral insect screen 

Glazing gasket 

Fixing 

Reduce glass height by 71mm to 

accommodate the vent. If the window frame 

has a very deep rebate, measure the bar 

against the frame. If necessary to trim on 

site, remove end caps from the vent and trim 

it equally at each end (so that the slotted 

area remains central) to a length 48mm less 

than the glass width (ie allowing 24mm for 

each end cap). Place glazing gasket on top 

edge of glass, position one end of vent 

accurately and push on to gasket. Trim 

gasket to length of vent, then replace end 

caps. Fit glazing beads over end caps. 

For combustion air vent (permanently open) 

the internal flap will be supplied located and 

held captive behind the nibs in the end caps. 

Length see Dimensions 

Handle/catch on internal flap 

Dimensions 

Manufactured to accommodate 20, 24 or 

28mm glazing thickness. 

Supplied as a finished product cut to finished 

size. 

Other modular ventilation capacities can be 

manufactured to order, subject to or 

proportional to vent length. 

Vent length including end caps equals glass 

width. 

Optional cord 

operator 

Minimum vent length to provide specified ventilation area 

Vent code Ventilation opening Minimum 

free area equivalent area vent length 

TVSG 2000mm2 1250mm2 225mm 

4000mm2 2500mm2 337mm 

6000mm2 3450mm2 450mm 

8000mm2 4390mm2 600mm 

.......................................................................................... 

End cap 

















K OR Building 




F, by means of glazed-in 


a constant *.........mm2 free area or *...........mm2 equivalent area of 

ventilation irrespective of 

window width (Passivent 

Superglaze Glazed-in 

Ventilator). 

Ventilators to suit 

*.......mm glazing 

thickness, and to 

comprise extruded 

aluminium outer section 

with polyester paint finish 

to BS 6496: 1984, 

extruded PVC-U inner 

section forming integral 

thermal break, full-length 

internal flap of polyester 

powder-coated extruded 

aluminium with 

combined handle and 

catch of polypropylene 

providing snap closure, 

and foam gasket seal; 

injection-moulded 

polypropylene end caps to 

cover flap ends and have 

an integral spring 

mechanism to assist 

closing. 

Ventilators to be certified 


Agrement (BBA) and to 

meet or exceed the worst 

case requirements of 

BS 6375: Part 1: 2000 for 


penetration. 






Telephone: 0161 962 7113, 

Fax: 0161 905 2085. 


*Insert figures required 

41

Fresh 80 

Fresh 90 

Fresh 100 

Fresh 99H 

Fresh TLF 

External grille 

42 

......................... 


................................................ 

........................................................................................... 

FRESH WALL VENTS 

FRESH WALL VENT RANGE 

The Fresh range are non-mechanical 

through-wall vents. 

Fresh 80, 90, 100 and TLF are manuallycontrollable 

vents, ideal for newbuild or 

refurbishment in domestic and small 

commercial applications. 

Fresh 99H is a demand-controlled vent 

which responds automatically to changes in 

room humidity. Designed specifically to 

combat condensation problems, particularly 

in existing buildings, especially local 

authority and housing association dwellings. 


Feature Fresh type 

80 90 100 99H TLF 

Easily controlled by pull cord ● - ● - - 

Easily controlled by slider control - ● - * ● 

Optional pre-settable trickle ventilation facility ● ● ● ● - 

Dust and insect filter 

Designed to prevent draughts and 

● ● ● ● ● 

provide efficient air distribution 

Condensation protection by insulation 

● ● ● ● ● 

within internal controller unit ● ● ● ● ● 

*see special features below 

Special features 

Fresh 99H 

● Energy saving: provides ventilation only 

when needed, minimising loss of warm air. 

● Not dependent on occupier operation, and 

can be made tamper-proof. 

● Needs no electrical connection or power 

supply, and has no running costs. 

● No maintenance required. 

● Optional manual on/off override cord 

control if required. 

Fresh TLF 

● Stylish new design. 

● Easily controlled by slider-operated 

precision damper. 

● Alternative options: cord regulator, fixed 

rate air flow. 

● Colour matched internal cover to special 

order. 







Also meets the requirements for security, 





Fresh acoustic wall cowl 

Robust wall cowl designed to fit over and 

protect the external grille in high-risk areas. 

Manufactured from ABS and supplied with 

vandal resistant, security fixing screws the 

cowl provides both vandal and impact 

resistance. 

Wall cowl 

...........................................................................................

.......................................................................................................... 

...... ................................................................................. 

Fresh 80 

Internal controller 138mm diameter x 55mm depth 

Wall sleeve outside diameter 86mm. Suitable for any wall 

thickness up to 360mm as standard (or more to special 

order). 

External grille 140 x 140mm 

Fresh 90 

Internal controller 150 x 150 x 48mm depth 



order). 


Fresh 100 




order). 


Fresh 99H 

Internal controller 140 x 140mm x 60mm depth 



order). 


Fresh TLF 

Internal controller 168 x 156mm x 46mm depth 

Wall sleeve outside diameter 102mm. Suitable for any 

wall thickness up to 350mm as standard (or more to 

special order). 


......................................................................................................... 

43

44 

......................... 


......................... 

................................................................... 

FRESH WALL VENTS 

Accessories, optional 

Accessory Fresh type 

80 90 100 99H TLF 

Filter * * * - * 

Fresh air deflector ● - ● - - 

Fresh storm shield ● ● ● ● ● 

Fresh Duracowl external cowl** ● ● ● ● ● 

* Fresh 80, 90 and 100: environmental filter removes particles down to 1 micron including diesel 

particulates, dust and pollen (EU7). 

Fresh TLF: Flimmer filter providing high particle separation (F7), long effective life, and almost constant 

pressure drop for the entire filter life. Alternative option: EU3 pollen filter. 

**Designed to protect the wall-mounted external grilles from damage in areas of high exposure. 


Type code Ventilation opening 

free area equivalent area trickle* 

Fresh 80 4000mm2 2220mm2 0-2000mm2 Fresh 90 6000mm2 2630mm2 0-1200mm2 Fresh 100 6000mm2 3200mm2 0-2800mm2 Fresh 99H 6000mm2 3350mm2 0-1200mm2 Fresh TLF 5000mm2 2540mm2 - 

*Can be preset to free area shown when closed. 

Material (all vents) 

ABS (recyclable). 

Colour: internal controller white, external 

grille terracotta. 

Colour matched external grilles to special 

order. 

Installation 

Locate in a high position, typically 1.7m 

above floor level. 

Typical section through wall (Fresh 100) 

................................................................... 
















K OR Building 



Guidance Documents 

Part F, by means of wall 

ventilators (Passivent 

Fresh 80 / 90 / 100 / 99H / 

TLF). Each vent to provide 

up to ….. [insert figure] 

mm2 ventilation free area 

or ..… [insert figure] mm2 equivalent area. 

Vent controllable by pull 

cord / slider, with optional 

pre-settable trickle 

ventilation facility when 

closed. 

99H: ventilation rate 

demand-controlled 

automatically according to 

room humidity, with no 

electrical connection 

required. 

Ventilator internal 

controller, wall sleeve and 

external grille of ABS. 

Accessories: [insert] 







information available from 

Passivent Ltd, 



Telephone: 0161 962 7113, 

Fax: 0161 905 2085 

email: info@passivent.com.

ACOUSTIC 

VENTILATION 

................................ 

Acoustic solutions: 

Systems 46-47 

Background ventilation 48-53 

Combustion air ventilation 54-56 

.............................. 45

.......................................... 

............................................... 

............................................................................................................ 

ACOUSTIC SOLUTIONS: SYSTEMS 

The noise problem 

Noise pollution is becoming an increasing 

problem as transport systems develop and 

there are fewer greenfield sites available for 

newbuild housing. 

Ventilation is essential, and required by 

building regulations, but it can provide paths 

for noise to penetrate. 

Passivent ventilators and systems can provide 

solutions to meet the needs of noisy sites, 

backed by our free comprehensive design 

service for acoustic ventilation using our 

products. 

The following information on noise and 

ventilation is given as background only, and 

specifiers and designers should seek 

Category 

Category 

Category 

A 

B 

C 

Category 

D 

specialised guidance from Passivent or an 

acoustic consultant. 

Noise levels and planning 

PPG24 Planning policy guidance: Planning 

and noise defines four noise exposure 

categories (NECs) for new dwellings, see 

table. Definitions of categories derive from 

standardised measurements of noise from 

road, rail and air traffic by day and night. 

PPG24 recommends that planning authorities 

considering applications for new housing take 

into account the noise exposure category of 

the site. Protection against noise may be 

made a condition of planning permission. 

Because of this, acoustically treated 

ventilation will often make it possible to 

Noise exposure category (from PPG24) Comments 

“Noise need not be considered as a 

determining factor in granting planning 

permission, although the noise level at the 

high end of the category should not be 

regarded as a desirable level.” 

“Noise should be taken into account when 

determining planning applications and, 

where appropriate, conditions imposed to 

ensure an adequate level of protection 

against noise.” 

“Planning permission should not normally be 

granted. Where it is considered that permission 

should be given, for example because there are 

no alternative quieter sites available, conditions 

should be imposed to ensure a commensurate 

level of protection against noise.” 

“Planning permission should normally be 

refused.” 

ACOUSTIC VENTILATION 

Housing at the high end of Category A may 

require acoustically treated wall or window 

vents in habitable rooms. 

In Category B it would normally be 

recommended that ventilation is designed to 

avoid the need to open windows. In the past, 

treatment has meant the use of large unsightly 

acoustic boxes for input and extract, drawing 

attention to the problem of noise. PPG24 now 

recommends whole-house systems as an 

alternative, because these operate 

continuously, unlike input/extract acoustic 

boxes which are normally switched off. 

In Category C further acoustic treatment to 

ventilation will be required to avoid the need 

to open windows. 

obtain planning permission for developments 

that would otherwise be refused. 

Windows and other construction 

A partially open window provides sound 

reduction of about 10 to 15 dB. Thus if 

external noise levels are more than 10 to 

15 dB above internal noise level criteria, 

openable windows are not an acceptable 

means of ventilation, and an alternative 

acoustically treated ventilation is required. 

When designing acoustic ventilation it is 

essential to ensure that the building fabric 

(walls, roof and windows) also provide 

adequate sound insulation, and that other 

routes for sound penetration are closed off. 

.......................................................................................................... 

46

.......................................................................................................... 

............................................................................................................ 


Passivent PSV and MEV systems with 

acoustic treatment are an effective, energyefficient 

means of providing ventilation and 

meeting planning guidance for noisy areas 

(see table of Noise exposure categories). 

Continuously-operating whole-building 

systems are recommended by PPG24, and 

BRE Digest 338 suggests that they may be 

more economical. 

Passivent Solutions 

Passivent PSV system for Categories A-B 

Sound insulation is provided primarily by 

the use of acoustic inlets, and if necessary 

acoustic ducting. Systems can be terminated 

on the roof or on a façade away from noise 

sources, so improving effectiveness. An MEV 

system requires far less background 

ventilation than an intermittent fan system, 

so reducing window/wall penetrations and 

lessening the need for acoustic treatment. 

With fan-assisted ventilation systems it is 

important that the fan itself does not add to 

noise. In Passivent MEV systems the fan is 

located in the roof space or a cupboard 

rather than in a room. 

Passivent PSV provides continuous gentle extraction 

from kitchens and bathrooms. It is preferable to wall 

fans because ducted extraction through roof terminals means no 

noise from outside and no fan noise. Acoustically treated window 

or wall vents in habitable rooms replace the extracted air. 

Automatic control according to room humidity is possible. 

Passivent MEV system for Categories B-C 

Passivent MEV whole-house systems provide a discreet 

alternative to acoustic boxes; in many cases there is no 

visible acoustic treatment. 

MEV fan-assisted systems include acoustically treated wall or 

window inlets in habitable rooms, and ducted extraction from 

kitchen and bathroom to a roof (or wall) terminal, via a single lowenergy 

continuously-running fan in the roof space or cupboard. 

Passivent MEV+ system for Category C 

Passivent MEV+ systems are similar to MEV with additional sound 

insulation such as acoustically treated ductwork. 

Passivent Limited offer a free comprehensive design service 

Certificate No. 96/3273 

Certificate No. 96/3273 

Extract ducts may need to be acoustically 

treated to prevent noise entering habitable 

rooms, and to control noise transfer between 

separate dwellings served by common 

ductwork. 

For more information on Passivent systems 

see page 10. 

.................................................................................. .............. 

47

48 

......................... 


......................... 

................................................................... 

ACOUSTIC SOLUTIONS: BACKGROUND VENTILATION 

PRODUCT RANGE 

Passivent acoustic vents: window and through-wall 

Vent type Ventilation opening (mm2 ) Sound insulation Page 

free area equivalent area (up to) Dn,e,w 


TVALdB 4200 2012-2500 40-42dB 

TVES4dB 4000 2760 39dB 

Wall vents 51-53 

Fresh 80dB 4000 2220 50dB 

Fresh 90dB 6000 2630 45dB 

Fresh 100dB 6000 3200 42dB 

Fresh 99HdB 6000 3350 45dB 

Fresh TLF-dB 5000 2540 44dB 

STM Acoustic wall vent 4000 3380 50dB 

Combustion air 54-56 

CA5 (window) 5000 - } Permanent air supply for 

Fresh 16 & 18 (wall) 5750, 10 000 - } fuel-burning appliances 

...................................................................

......................... 


......................... 

................................................................... 

ACOUSTIC WINDOW VENT TVALdB 

Internally mounted acoustic through frame 

vent providing substantial sound insulation. 

Ideal for use in buildings situated in noisy 

environments such as near main roads, 

railways or airports. For use with external 

Canopy Grille TVCG390, see page 35. 












Dimensions and performance 


● Sound insulation 

Provides substantial sound reduction. 

Ideal for noisy environments. 

● Very robust 

Durable, and suitable for areas with high 

risk of abuse. 

● Clean 

Internal filter prevents insect and dust 

ingress, helping to keep rooms clean. 

● Easy to operate 

Airflow can be easily regulated by the user. 


See table. 

Material 

Aluminium with polyester paint finish, 

injection-moulded ABS end caps. 

Colour: white or grey. Other colours to 

special order. 

Sound insulation 

See table. 

Fixing 

Screw fix to wall clips to the inside face of the 

window and frame head and press the vent 

into place. The seal material on the vent 

ensures a tight fit against the frame. 

Type code Overall Ventilation opening Sound reduction Slot size 

length free area equivalent area up to 

TVALdB 450/40 456mm 4200mm2 2500mm2 40dB Dn,e,w 350 x 12mm 

TVALdB 800/42 806mm 4200mm2 2012mm2 42dB Dn,e,w 350 x 12mm 

TVALdB 450/40 WS* 456mm 4200mm2 2500mm2 40dB Dn,e,w 350 x 12mm 

*Including storm shield 






ventilation complying with 














means of internal window 

ventilators giving 4000mm2 free area or 

*2495/2012mm2 equivalent 

area of ventilation (Fresh 

AL-dB) to achieve up to 

*40/42dB D n,e,w sound 

reduction. Made of 

aluminium with ABS end 

caps. Supplied with dust 

and insect filter as standard. 



requirements of 

BS 6375: Part 1: 2000 for 


penetration in conjunction 

with specified external grille 

(Passivent TVCG390). 

Ventilators and information 

available from Passivent Ltd, 



Telephone: 0161 905 2085 

Fax: 0161 905 2085 


*Delete as required 

................................................................... 49

Height 

45mm 

50 

Depth 64mm 

......................... 


......................... 

................................................................... 

HUMIDITY SENSITIVE ACOUSTIC WINDOW VENT 

TVES4dB is a through-frame humiditysensitive 

acoustic window vent providing 

effective ventilation and sound insulation, for 

use near noise sources such as main roads, 

railways or airports. For use with external 

Canopy Grille TVCG390, see page 33. 












Overall length 

420mm 

Dimensions 


● Sound insulation 

Provides substantial sound reduction. 

Ideal for noisy environments. 

● Energy saving 

The vent automatically opens and closes 

according to humidity level, ensuring the 

correct level of ventilation whilst minimising 

loss of warm air and so saving energy. 

● Ease of operation 

Does not require manual control. 


See table. 

Material 

Injection-moulded polystyrene. 

Colour: white, brown or black. Other colours 

to special order. 


See table. 

Fixing 

Rout two slots in the window frame head, 

160 x 12mm with 10mm blank between. 

Remove the vent cover, fix the vent to the 

frame by two screws and refit the cover. 

Type code Ventilation opening Sound reduction 

free area equivalent area (up to) 

TVES4dB 4000mm2 2760mm2 39dB 

Slot sizes: 2 slots 160 x 12mm with 10mm blank between 

................................................................... 
















K OR Building 




F, by means of automatic 

humidity controlled 




of ventilation (Passivent 

TVES4DB), to operate 

between 47% and 65% 

relative humidity and 

achieve up to 39dB D n,e,w 

sound reduction. 



requirements of BS6375: 


to water penetration in 

conjunction with specified 

external grille (Passivent 

TVCG390). Ventilators 

and information available 

from Passivent Ltd, 2 

Brooklands Road, Sale, 


Telephone: 0161 962 7113 

Fax: 0161 905 2085 



Vent open Vent closed

Fresh 80dB 

Fresh 90dB 

Fresh 99HdB 

Fresh 100dB 

Fresh TLFdB 

STM 

......................... 


......................... 

................................................................... 

FRESH ACOUSTIC WALL VENTS 

FRESH ACOUSTIC WALL VENT RANGE 

Fresh acoustic wall vents provide effective 

ventilation and sound insulation, for use 

near noise sources such as main roads, 

railways or airports. 

Fresh 80dB, 90dB, 100dB and TLF-dB are 

non-mechanical, controllable through-wall 

vents. Ideal for newbuild or refurbishment in 

domestic and small commercial applications. 

Fresh 99HdB is a demand-controlled nonmechanical 

through-wall vent which 

responds automatically to changes in room 

humidity. Designed specifically to combat 

condensation problems, particularly in 

existing buildings, especially local authority 

and housing association dwellings. 

STM is an acoustic wall ventilator providing 

options of either self-regulating or humidity- 


Feature Fresh type 

80dB 90dB 100dB 99HdB TLF-dB STM 

Easily controlled by pull cord ● - ● * - - 

Easily controlled by slider control 

Optional pre-settable trickle 

- ● - - ● - 

ventilation facility 

Designed to prevent draughts and 

● ● ● ● - - 

provide efficient air distribution 

Condensation protection by insulation 

● ● ● ● ● ● 

within internal controller unit ● ● ● ● ● - 

Dust and insect filter ● ● ● ● ● - 

*see special features below 

Special features 

Fresh 99HdB 

● Energy saving: provides ventilation only 

when needed, minimising loss of warm air. 

● Not dependent on occupier operation, and 

can be made tamper-proof. 

● Needs no electrical connection or power 

supply, and has no running costs. 

● No maintenance required. 

● Manual on/off override cord control. 

Fresh TL-dB 

● Stylish new design. 

● Easily controlled by slider-operated 

precision damper. 

● Colour matched internal cover to special 

order. 

controlled background ventilation combined 

with excellent acoustic properties. 

Specifically designed for newbuild 

applications, with the sound absorption box 

being built into the wall internally and 

terminating in a double airbrick externally. 


All vents can be used to meet the 

background ventilation requirements of 

building regulations throughout the UK and 

the Republic of Ireland, as part of a suitably 







STM 

● Vent is set into the wall with only a narrow 

projecting air outlet. 

● Self-regulating version prevents overventilation 

in windy conditions. 

● Humidity-controlled version automatically 

provides ventilation to meet demand, 

minimising loss of warm air and thereby 

saving energy. 

................................................................... 51

52 

......................... 


................................................. 

........................................................................................... 

FRESH ACOUSTIC WALL VENTS 


Type code Ventilation opening 

free area equivalent area trickle (1) 

Fresh 80dB 4000mm2 2220mm2 0-2000mm2 Fresh 90dB 6000mm2 2630mm2 0-1200mm2 Fresh 100dB 6000mm2 3200mm2 0-2800mm2 Fresh 99HdB 6000mm2 3350mm2 - 

Fresh TLF-dB 5000mm2 2540mm2 - 

STM-SR (2) 4000mm2 3380mm2 - 

STM-HC (3) 4000mm2 3380mm2 - 

(1) Can be preset to free area shown when closed. (2) Self-regulating (3) Humidity-controlled 

Material 

All Fresh vents: ABS (recyclable) with sound 

insulating wall sleeve (glass fibre with PVC 

skin). 

Colour: internal controller white, external 

grille terracotta. 

Colour matched external grilles to special 

order. 

STM: polystyrene. Colour white. 


The vents provide sound reduction across 

300mm wall thickness of up to the values 

shown in the table below. These can be 

increased by approximately 2dB Dn,e,w when 

fitted with Fresh Acoustic Cowl (except for 

STM). 

Test reports are available on request. 

Type Sound reduction up to 

80dB 50dB Dn,e,w 



99dBH 45dB Dn,e,w 

TLF-dB 44dB Dn,e,w 

STM 50dB Dn,e,w 

Installation 

Locate in a high position, typically 1.7m 

above floor level. 

Fresh 99HdB 

Internal controller 140 x 140mm x 

60mm 

Backplate 165 x 165mm 

Wall sleeve outside diameter 

140mm. Suitable for any wall 

thickness up to 300mm as standard 

(or more to special order). 


...........................................................................................

..... ................................................................ 

..... ........................................... 

Fresh 90dB 

Internal controller 150 x 150mm x 48mm 


Wall sleeve outside diameter 140mm. Suitable for 

any wall thickness up to 300mm as standard (or 

more to special order). 


Double 

airbrick 

Self-Regulating 

STM-SR 

STM 

Wall plate 535 x 195mm 

Wall box 500 x 160mm 

Wall sleeve outside diameter 125mm 

Suitable for any wall thickness up to 300mm 

as standard (or more to special order) 

Humidity-Controlled 

STM-HC 

Fresh 80dB 



Wall sleeve outside diameter 140mm. Suitable for any wall thickness up to 

300mm as standard (or more to special order). 


Fresh TLF-dB 

Internal controller 168 x 156mm x 46mm 


Wall sleeve outside diameter 140mm. Suitable 

for any wall thickness up to 300mm as standard 



Fresh 100dB 

Internal controller 184mm diameter x 65mm 

depth 


Wall sleeve outside diameter 140mm. Suitable 

for any wall thickness up to 300mm as standard 



Section through wall: 

surface mounting 

concealed mounting 

.......................................................................................... 






ventilation with sound 

insulation complying with 










K OR Building 



Guidance Documents 

Part F, 

by means of acoustic wall 

ventilators (Passivent 

Fresh 80dB / 90dB / 

100dB / 99HdB / TLF-dB / 

STM). Each vent to 

provide up to ….. mm2 ventilation free area or 

..… mm2 equivalent area, 

and to achieve sound 

reduction of ..… dB Dn,e,w 

for 300mm wall thickness 

under test. 

Vent controllable by pull 

cord / slider, with optional 

pre-settable trickle 

ventilation facility when 

closed. 

99HdB: ventilation rate 

demand-controlled 

automatically according 

to room humidity, with no 

electrical connection 

required. 

STM: self-regulating 

humidity controlled 

ventilator of polystyrene. 

All Fresh vents: ABS 

(recyclable) with sound 

insulating wall sleeve 

(glass fibre with PVC 

skin). 











Telephone: 0161 962 7113, 

Fax: 0161 905 2085 


53

54 

......................... 

.................................................................. 

COMBUSTION AIR VENTILATION 

Passivent combustion air vents provide a 

permanent supply of combustion air to rooms 

containing fuel-burning appliances which 

are not room-sealed. Can be used to meet 

gas safety regulations and the requirements 

of Building Regulations Approved 

Document J1. 

There are window and wall models, and 

standard vents are sufficient for most 

domestic heating appliances. 

........................ 

Requirements 

All open-flued fuel-burning appliances 

require an adequate supply of combustion 

air from the room so that: 

- The appliance and its flue operate efficiently. 

- Fuel is properly burnt, so harmful fumes 

are not produced. 

- The appliance will not draw oxygen from 

the air in the room. 

- Combustion products are properly vented 

through the flue to avoid any risk of buildup 

inside the room. 

The provision of an adequate air supply is a 

mandatory requirement of the Building 

Regulations J1. There is also a legal 

obligation when installing or servicing 

appliances to ensure that there is an 

adequate air supply. This is particularly 

important when new windows or doors have 

been fitted, which are usually 

weatherstripped, so cutting down the 

‘accidental’ air supply. Failure to comply 

could have tragic consequences. 

To meet the requirement, a vent should be 

installed which must not be closeable, 

should prevent draughts, and must be large 

enough for the rating of the appliance. 

...................................................................

External vent 

........................ 

........................ COMBUSTION AIR VENTILATION 

.................................................................. 

COMBUSTION WINDOW VENT 

Through-frame window vent comprising two 

identical units, one fitted externally for 

weather protection and the other (inverted) 

internally. 



Avoids draughts and discomfort, avoids 

risk of occupants blocking vent. 

● 5000mm2 free ventilation area as standard. 

Sufficient for most domestic heating 

appliances. 

● 9mm insect grille of injection-moulded 

plastic. 

Complies with BS 5440-2: 2000. Robust, 

will not rot or corrode. 

Internal vent 

Height 

30mm 

15mm minimum 

clearance 

required to allow 

free air flow. 

Depth 22mm 

Length 366mm 

Dimensions 

Type code Ventilation free area Length Slot size 

TVCA5 5000mm2 366mm 340 x 15mm 

Other lengths and ventilation areas to special order. 

Capacity 

Based on Approved Document J1/2/3, one 

pair of Combustion Air Vents is suitable for: 

- Gas appliances up to 18kW (61 000Btu/h) 

input. 

- Solid fuel closed appliances up to 14kW 

(47 000Btu/h) output. 

- Solid fuel open appliances up to 10 000mm 2 

throat opening area. 

- Oil burning appliances up to 14kW 

(47 000Btu/h) output. 

Material 


BS 6496. Injection-moulded plastic end caps 

and insect grille. 

Colours: white or brown. Colour coordinated 

end caps. Other colours to special 

order subject to minimum quantities. 

Fixing 

By two screws through end lugs. 

Ordering 

Packed individually, therefore two vents 

must be ordered for each installation. 

TVCA5 

................................................................... 

External vent 

Internal vent 

55

56 

......................... 

COMBUSTION AIR VENTILATION 

......................... 

................................................................... 

COMBUSTION WALL VENTS 

Fresh 16 and 18 

Fresh 16 and 18 wall vents comprise an 

internal grille, wall sleeve and external grille 

with insect screen and rain deflectors. 


See Dimensions table. 

Material 

ABS (recyclable), polystyrene wall sleeves. 

Colour: internal grille white, external grille 

terracotta. 

External grille 

Dimensions 

Fresh 16 

(Fresh 18 similar) 

Internal grille 

Fresh 16 Fresh 18 

Ventilation free area 5750mm 2 10 000mm 2 

Wall sleeve outside diameter 99mm 122mm 

Suitable for wall thickness up to (as standard) 310mm 310mm 

Internal and external grilles 140 x 140mm 180 x 180mm 

Capacity 

Vents are suitable for the following maximum appliance ratings. 

Appliance type Fresh 16 Fresh 18 

Gas (input) 19kW (64 000Btu/h) 29kW (98 000Btu/h)* 

Solid fuel closed (output) 15kW (51 000Btu/h) 23kW (78 000Btu/h) 

Oil (output) 

* Including decorative fuel effect fires. 

15kW (51 000Btu/h) 23kW (78 000Btu/h) 

................................................................... 

Specification clauses 

TVCA5 Provide 

combustion air 

ventilation giving 

5000mm2 ventilation area 

by means of an internal 

vent combined with an 

external vent for weather 

protection (two Passivent 

Combustion Air Vents 

TVCA5), of aluminium 

with polyester paint finish 

to BS 6496: 1984, fitted 

with colour co-ordinated 

end caps and 9mm insect 

grille of injectionmoulded 

plastic 

complying with 

BS 5440-2: 2000. 

Fresh 16 and 18 

Provide combustion air 

ventilation giving *5750 / 

10 000 mm2 ventilation 

area by means of a 

through-wall vent 

(Passivent *Fresh 16 / 

Fresh 18 combustion air 

vents). Internal grille, 

external grille and wall 

sleeve of ABS. Grilles to 

have 9mm apertures 

complying with 

BS 5440-2: 2000 







Telephone: 0161 962 7113, 

Fax: 0161 905 2085. 

Email: info@passivent.com

COMPONENTS, 

SERVICES 

................................ 

Selected components 58-61 

Design and support, Services 62-63 

References 64 

.............................. 57

58 

PSV ground floor 

extract system 

........................ ................................................ 

Air extract 

Insulated ducting 

in roof space 

Uninsulated 

ducting in 

heated spaces 

COMPONENTS, SERVICES 

............................................................................ 

TYPICAL SYSTEMS 

Ridge terminal 

and adaptor 

MEV system 

Insulated ducting in 

roof space 

Uninsulated ducting 

in heated spaces 

Flat channel 

ducting 

Extract fan 

Air extracts 

Air extracts 

...........................................................................................

................................................ ......................................... 


............................................................................................................ 

SELECTED COMPONENTS FOR PSV / MEV SYSTEMS 

Window inlets 

A101 plus PVCG4 

Humidity-sensitive window inlet and 

external canopy grille. 

Slot size 290 x 15mm. 

PVFV4 plus PVCG4 

Manually-controlled window inlet and 

external canopy grille. 

Slot size 308 x 15mm. 

Fixing 

Cut a slot in the head of the window frame 

(if necessary) and screw-fix the internal 

vent to the inside and the canopy grille to 

the outside. 

Wall inlets 

A111 plus PV250 

Humidity-sensitive wall inlet with airbrick 

and telescopic sleeve. For walls up to 300mm 

thick. 

Hole size 57 x 290mm. 

A111 plus PV250DB, Acoustic 

Humidity-sensitive wall inlet with airbrick 

and acoustic telescopic sleeve. For walls up 

to 300mm thick. 

Hole size 57 x 290mm. 

Air extracts 

A161 

Humidity-sensitive extract 195mm dia 

Hole 135mm dia. 

......................................................................................................... 

59

.......................................... 


................................................ 

............................................................................................................ 

SELECTED COMPONENTS FOR PSV / MEV SYSTEMS 

Ducting 

F12513M 

Flexible uninsulated ducting: 

125mm dia. x 3m 

F12524M 

Flexible insulated ducting: 125mm dia. x 4m 

R1251 

Rigid uninsulated ducting: 125mm dia. x 3m 

MC01 

Sleeve coupling, male: 125mm dia. 

Flat channel ducting 

FCD1 

Flat channel ducting 204 x 60mm x 1.5m 

FCA3 

Straight connector 

208 x 64mm x 74mm 

FCA4 

Circular connector 

125mm dia. 

FCA6 

Circular adaptor 

FCA4 and FCA6 are 

required for 

connection to 

flexible ducting. 

FCA10 

Elbow connector 

125m dia. 

FCA11 

Round pipe 

FCA10 and FCA11 are 

required for connection 

to wall-mounted extract 

129mm dia x 350mm 

Airbricks 

Horizontal Double Airbricks with flat 

channel adaptor 

........................................................................................................... 

60 

HDAA 

HDAS

.......................................................................................................... 

............................................................................................................ 

Fire dampers 

Provide 1 hour fire resistance tested to 

BS476. 

FDR125 

Resettable fire damper 

for 125mm dia ducting 

PFW200 

Intumescent wrap for 

use with flat channel 

ducting 

Jointing accessories 

X331 

Duct tape 

One roll is normally sufficient for one 

house. 

X332 

Speedclamp 

Terminals 

PRT Ridge terminal 

Connect insulated ducting to the adaptor 

spigot using tape (X331) and a Speedclamp 

(X332). 

Fit the adaptor to the extension 

sleeve from inside 

the roof. 

TT7 In-Line tile/slate terminal 

Alternative termination suitable for 

bathrooms and WC’s only. 

Connect insulated ducting to the spigot 

using tape (X331) and a 

Speedclamp (X332). 

TT9 Tile/slate terminal 

Connect insulated ducting to the spigot 

using tape (X331) and a Speedclamp (X332). 

.......................................................................................................... 

61

62 

......................... 


................................................ 

........................................................................................... 

DESIGN AND SUPPORT 

Technical expertise 

Passivent Limited boast a full team of highly 

trained technical sales representatives and 

technical officers, which allow Passivent to 

take the worry of ventilation away from the 

client. 

The experienced Passivent Limited technical 

team are highly skilled and experienced in 

identifying specific client requirements, and 

recommending the optimum method of 

ventilation, both to ensure that Part F of the 

Building Regulations is adhered to, and to 

ensure that the air inside a dwelling is as 

clean and comfortable as possible for the 

intended occupants. 

Design services 

Passivent Limited offer a design service 

based on building drawings supplied for both 

PSV and MEV systems. 

Acoustic systems can be individually 

designed in conjunction with acousticians to 

meet noise reduction targets set by the client 

or local authority. 

For MEV systems we can provide an outline 

proposal based on building drawings 

supplied to us. This will comprise typical 

outline schematic drawings and a system 

description together with a cost indication. 

The benefit of this is that the proposal and 

cost can be provided rapidly at an early stage. 

Following confirmation of acceptance of the 

outline proposal, a detailed design and 

costing will be prepared including system 

drawings and detailed component 

requirements. 

Passivent use state of the art Computer 

Aided Design (CAD) software which offers 

full tailorability, allowing technical experts 

to design systems for a client’s specific 

needs. The system will also generate airflow 

schedules for use when commissioning, 

along with accurate BOM’s and installation 

schematics, all assisting the client 

throughout the design and installation 

process. 

Customer services 

● Design consultation (at client’s office) 

Convenient and efficient for the client and 

ensures that the total focus is on the 

client’s own specific needs. 

● Research and development 

Ensuring that Passivent technologies are 

always at the cutting edge of ventilation 

solutions. 

● Product design, manufacture and supply 

Allows full control over the whole process 

giving a fully tailored solution to the 

client’s specific needs. 

● Project management 

From the identification of initial 

requirements right through to the 

installation and operation of an efficient 

and effective ventilation solution, 

Passivent can manage every stage to 

minimise client workload and concern. 

● Full design and quotation service 

Ensures that systems are tailored and 

designed to meet specific client needs in 

line with budgetary requirements. 

● Technical back-up and site visits 

Ensures that clients always have access to 

expertise and minimises any on-site 

problems which may arise. 

● Installation (Mastercare) 

Passivent can provide fully trained and 

approved installers to install Passivent 

systems. This ensures that ventilation 

solutions operate as planned and designed. 

● Free appraisal and quotation 

Allows the client, at no cost, to assess what 

is required to comply with building 

regulations and improve air quality in 

dwellings 

...........................................................................................

.................................................................... 

..................................................................... 

Mastercare TM Installer Scheme 

We recommend that installation is carried 

out by a specialist Passivent Mastercare 

Installer. The Mastercare scheme, operated 

by Passivent Limited, comprises wellestablished 

and reputable companies who 

have been fully trained and assessed by 

Passivent Limited to install any Passivent 

system in both new build and refurbishment 

projects. 

Mastercare provides: 

● Assurance that work is carried out by 

trained and experienced installers who are 

familiar with the systems. 

● Quality installations. 

● Compliance with relevant codes of 

practice. 

● Competitive cost. 

All Passivent Mastercare Installers hold a 

certificate from Passivent Limited. They are 

regularly monitored to ensure standards of 

work are maintained, and also receive full 

technical support from Passivent Limited. 

..................................................................... 

63

......................... 

......................... 

................................................................... 

FURTHER INFORMATION 

References 


England and Wales 

Building Regulations 2000 

Approved Document F Means of ventilation 

(2006) 

Approved Document L 

L1A 2006 Conservation of fuel and power 

(New dwellings) (2006 edition) 

L1B 2006 Conservation of fuel and power 

(Existing dwellings) (2006 edition) 

Scotland 

Building (Scotland) Regulations 2004, 

Technical Handbook Domestic Section 3 

Environment (2007) 

Northern Ireland 

Building Regulations (Northern Ireland) 

Technical Booklet K Ventilation (1998) 

Republic of Ireland 

Building Regulations Technical Guidance 

Documents, Part F Ventilation (2002) 

Other documents 

BS 5250: 2002 incorporating 

Amendment 1: 2005 Code of practice for 

control of condensation in buildings 

BS EN 13141-1: 2004 Ventilation for 

buildings. Performance testing of 

components / products for residential 

ventilation. Externally and internally 

mounted air transfer devices 

BS 5925: 1991 Code of practice for 

ventilation principles and designing for 

natural ventilation 

The Government’s Standard Assessment 

Procedure for Energy Rating of Dwellings 

(2005). Published by BRE for DEFRA 

Energy efficient ventilation in dwellings - a 

guide for specifiers (2006). Energy Saving 

Trust GPG 268 

Acoustics 

PPG24 Planning policy guidance: Planning 

and noise (DCLG, 1994) 

BS 8233: 1987 Sound insulation and noise 

reduction for buildings 

BS EN 20140-10: 1992 Acoustics. 

Measurement of sound insulation in 

buildings and building elements. Laboratory 

measurement of airborne sound insulation 

of small building elements (= ISO 140- 

10.1991) 

BRE Digest 338 1988 Insulation against 

external noise 

Other products 

Passivent market a wide range of other 

natural ventilation and daylighting products 

for which separate literature is available, 

including: 

Passivent commercial ventilation products 

Airscoop ventilators (roof-mounted natural 

ventilation terminals) 

Airstract ventilators (roof-mounted highcapacity 

terminals) 

Aircool ventilators (controllable façade 

ventilators) 

Passivent natural daylighting solutions 

(Glidevale Sunscoop, Metro modular 

rooflights, Litevent ventilation/daylighting 

units) 

Passivent ventilation system controls 

................................................................... 

PASSIVENT LIMITED 

2 Brooklands Road, Sale, Cheshire M33 3SS Tel: 0161-962 7113 Fax: 0161-905 2085 

Email: info@passivent.com Web: www.passivent.com 

Passivent Limited maintains a policy of continuous development and reserves the 

right to amend product specifications without notice. 

A member of the Building Product Design Group 

...................... ......................

iMEV - Ecobuild

Create successful ePaper yourself

Delete template?

Save as template?