Swirl Diffusers Product and Applications - TROX

TB-100202
Swirl Diffusers
Product and Applications
Trox USA, Inc. Telephone 770-569-14 33
926 Curie Drive Facsimile 770-569-14 35
Alpharetta, Georgia 30005-8369 e-mail tb10@troxusa.com
USA

General Information · Contents
Contents
General Information 2
Available Models 3
Operation/Applications 5
Selection Procedures 6
TDF/TDV Series Diffusers 8
VDW Series Diffusers 12
RFD Series Diffusers 16
RFD-D Series Diffusers 20
DCS Series Diffusers 24
VDL/VDZ Series Diffusers 28
High Air Change Applications 34
Swirl Terminal Filters 38
TDF Series
RFD-D Series
TROX “Swirl” type ceiling diffusers are designed to provide
optimum mixing of conditioned supply air with that of the
space, thereby minimizing draft temperatures and velocities
within the occupied or process levels.
These diffusers rely on a high velocity cyclonic discharge
pattern to increase the induction of room air and rapidly
dissipate temperature and velocity differentials associated with
the supply air stream.
Their unique design enables them to create room air induction
ratios significantly greater than those of conventional diffusers.
Swirl diffusers have been succesfully used in European
process and comfort conditioning applications for over thirty
years. They are widely employed for critical process
applications such as fume hood laboratories, clean rooms,
industrial drying facilities and hospital operating room
applications. In fact, they are ideal for use in any application
involving high air changes or high sensible loads. They are
also capable of supplying significant airflow quantities (see
page 34 for high air change applications) while minimizing
space air velocity disturbances in applications such as animal
research laboratories.
Swirl diffusers are available in a variety of shapes and sizes to
fit any application or aesthetic requirement. Unlike conventional
outlets, swirl diffusers do not require a ceiling surface to
properly operate. Certain models incorporate automatic
adjustment of their discharge pattern to facilitate heating and
cooling applications in high ceiling areas.
Swirl diffusers can also be fitted with high efficiency particulate
filters for clean room applications (see page 38 for further
details).
2

Available Models
TDF Series
Fixed Horizontal Discharge
(See Pages 8 through 11 for details)
TDV Series
Adjustable Horizontal Discharge
(See Pages 8 through 11 for details)
VDW Series
Adjustable Horizontal Discharge
(See Pages 12 through 15 for details)
RFD Series
Fixed Horizontal Discharge
(See Pages 16 through 19 for details)
3

Available Models
RFD-D Series
Fixed Horizontal Discharge
(See Pages 20 through 23 for details)
DCS Series
Fixed Horizontal Discharge
(See Pages 24 through 27 for details)
VDL Series
Adjustable Horizontal/Vertical Discharge
(See Pages 28 through 33 for details)
VDZ Series
Adjustable Horizontal/Vertical Discharge
(See Pages 30 through 33 for details)
4

Applications
Swirl Diffuser Operational Characteristics
Although offered in various shapes and sizes,TROX Swirl diffusers
all share a similar core design. A series of linear slots are
aligned radially around the center of the diffuser face. These
slots divide the supply air to the diffuser into a number of high
velocity jets. This increase in supply jet surface area enables
the diffuser to induce large quantities of room air. In most
designs, the slots are subdivided along their length to further
enhance the induction rate.
The supply jets are also discharged in a cyclonic pattern,
which forces the air jets to travel in a rotating manner around
the diffuser center. During this travel, the jets induce additional
room air and rapidly dissipate the velocity and temperature
differentials between the jet and the ambient air, minimizing the
distance at which high velocities and/or drafts exist. This high
induction performance also enables them to perform equally
well without an adjacent ceiling surface, making swirl diffusers
an excellent choice for areas where exposed ductwork is
employed.
The unique discharge characteristics of swirl diffusers make
them ideal for high air change applications involving air change
rates up to eighty (80) per hour. A section of this brochure is
dedicated to such applications (see page 34).
TROX also employs swirl technology in diffusers designed for
raised floor and underseat applications. For more information
on these products, contact your local TROX representative.
Swirl Diffuser Application Guide
Application Facility types TDF TDV VDW RFD RFD-D DCS VDL VDZ
Low Temperature Air Distribution
High Air Change Rates(see pg. 34)
Minimal Velocity Disturbance
High Sensible Cooling Loads
High Ceiling Heating/Cooling
Clean Room Applications
Offices, Schools, etc.
Clean Areas, Labs
Animal Laboratories
Offices, Schools, etc.
Convention Halls, Gyms
Labs, Hospitals, etc.
Legend Ideal Solution for this Application Rarely Used in this Application
Frequently Used in this Application
Suitable Product not Available
5

Technical Data and Performance Notes
European standards require manufacturers of air diffusion
products to provide technical data that allows the prediction of
local velocities and draft temperatures at any critical point in
the space. In accordance with this, TROX has tested its swirl
diffusers under a variety of supply air conditions and is able
to provide data that will enable the designer to estimate such
local thermal conditions.
Local velocities can be estimated by using the throw data in
the individual diffuser performance tables. The table below
presents a thermal decay factor (K T ) that can be used to
estimate local temperatures various distances from the diffuser.
The following equation to predict the temperature differential
between the supply air jet and the ambient air at any given
distance X from the diffuser discharge:
∆T X = K T
x ( A EFF
/ (X 1 or X 2 ) x ∆T Z
where ∆T Z is the initial temperature difference between the
supply and room air. A EFF is the effective outlet area of the
diffuser and is listed in the individual diffuser performance
tables.
Nomenclature
B
A
A
X 2
A/2
v Z
∆T
X1
Z
X
H 1
1
A, B Distance between opposing diffusers
X 1 Distance from diffuser to point X midway between
diffusers plus distance H 1 from ceiling
X 2 Distance from diffuser to point L along wall
V Z Jet velocity at point of discharge into room
∆T Z Temperature differential between supply and room air
at point of discharge from diffuser
V X Local velocity at point X
∆T X Predicted temperature differential between the
supply air jet and ambient room air at point X
V L Local velocity at point L
∆T L Predicted temperature differential between the
supply air jet and ambient room air at point L
X
X
v X
∆T X
v L
∆T L
L
Thermal Decay Constant
Diffuser Type TDF TDV VDW RFD RFD-D DCS VDL VDZ
Thermal Decay Constant (K T ) 1.54 2.00 0.77 0.86 0.85 1.06 1.90* 1.90*
* Applies to cooling applications only
6

Diffuser Selection
Selection Example 1
TDF swirl diffusers (top entry) are to be located (as shown
at right) in a laboratory with a nine (9) foot ceiling. The
diffusers will handle 650 CFM each and velocities at the
top of the fume hood sash (6 foot level) cannot exceed
60 fpm. The supply air is 55°F and the room temperature
is 72°F.
3
8
X1
X 1
4
v Z
∆T Z
X 2
7
Performance data for the TDF is shown on page 10. A size
605 diffuser is considered first as it can be integrated with
the lay-in ceiling grid.
X
v X
∆T X
v L
∆T L
L
At 650 CFM, the diffuser produces a throw (to 50 fpm) of
7 feet, therefore, the velocities at points L and X (the top of
the hood sash) will be 50 fpm or less. Using the equation
for thermal decay (X 1 and X 2 equal 7 feet):
Layout for Example 1
∆T X = ∆T L = 1.54 x ( .43 / 7 ) x 17 = 2.45°F
Selection Example 2
VDL swirl diffusers are to be used for heating and cooling
a convention space. The diffusers are mounted on exposed
duct drops 24 feet above the floor and must handle
1200 CFM each. Cool air is supplied at 55°F while warm
air is introduced at 95°F. The room temperature is to be
maintained at 75°F. Diagrams illustrating the application
can be found at the right.
Diffuser selection in high ceiling applications requiring both
heating and cooling are usually based on the heating mode
as the diffuser must be capable of projecting the warm air
stream to the occupied levels of the space.
24
6
20
10
∆T Z = -20F
v X
∆T X
Cooling
Mode
Performance data for the VDL is shown on page 32. A
size 400 unit will perform the required operation at a space
NC of 34.
Performance of the diffusers in the cooling mode indicate
throw values (to a 50 fpm terminal velocity) of about
10 feet, therefore, no drafts should be experienced in the
occupied zone (lower 6 feet).
24
20
10
∆T Z = +20F
The maximum vertical throw of the diffuser shown in the
performance table on page 32 represents the vertical
projection of the air stream (based on a 20°F temperature
differential). At this point, there is no temperature difference
between the supply and room air. For the diffuser being
considered, the maximum throw is 26 feet, which indicates
that the heated air stream will indeed penetrate the
occupied zone. The diffuser selection is valid.
6
V MAX
∆T VMAX
Layout for Example 2
Heating
Mode
7

Product Information · Application
Product Information Guide
Dimensional Information 9
Performance Data 10
Specification Text 11
Ordering Information 11
Features
• TDF series features a fixed swirl discharge pattern. Suitable
for surface mount or lay-in applications.
• TDV series incorporates adjustable pattern control elements
to allow field discharge pattern modification. Suitable for
surface mount or lay-in applications.
• Size 605 models are specifically designed to fit 2 x 2 lay-in
ceiling modules.
• TDF and TDV models include a top entry (type V) plenum
box suitable for connection to round duct. Side entry plenum
boxes (type H) are also available.
• Also available with integral HEPA filter (see page 38).
Construction
• Material: Galvanized Steel
• Finish: White powder coat paint.
TDF and TDV Series
Model TDF
Model TDV
Product Applicability
More Applicable
0 1 2 3 4 5 6 7 8 9 10
Low Temperature Air Distribution:
High Air Change Rates:
Minimal Velocity Disturbance:
High Sensible Loads:
High Ceiling Applications:
Model Availability
Mounting:
Fixed Pattern Adjustable Pattern
Adjustable Pattern Direct Duct
Fixed Pattern
(Top Entry Plenum) (Top Entry Plenum) (Side Entry Plenum) Connection
Surface: TDF-_-Z-V TDV-_-Z-V TDF-_-Z-H TDV-_-Z-H Not Available
Lay-in: TDF-Q-Z-V/605 * TDV-Q-Z-V/605 * TDF-Q-Z-H/605 * TDV-Q-Z-H/605 * Not Available
Filter Terminal: See page 38 Not Available See page 38 Not Available Not Available
* Designed to fit standard 2 x 2 (1 inverted t-bar) ceiling modules
8

Dimensional Information
TDF- and TDV- SilentAir
Models TDF-R and TDV-R
Models TDF-Q and TDV-Q
D 1 ø
R 1 ø
Dimensions
Size D1ø R1ø Q
400 13 1 /4 15 3 /4 15 5 /8
500 17 5 /16 19 5 /8 19 5 /8
600 20 7 /8 23 5 /8 23 1 /2
605 20 7 /8 23 5 /8 23 3 /4
625 20 7 /8 24 1 /2 24 1 /2
D 1 ø
Q
Plenum / Entry Options
Dø
H
K
K
8
H 4
Aø
Aø
H 1
H 2
H 3
Type V Plenum
Q
Type H Plenum
TDF-Q and TDV-Q Models
R 1 ø
Type H Plenum
TDF-R and TDV-R Models
Size Dø Aø K H H 1 H 2 H 3 H 4 R 1 ø Q
400 7 7 /8 7 7 /8 14 5 /8 1 1 /2 13 3 /8 1 5 /8 3 15 /16 12 15 3 /4 15 5 /8
500 7 7 /8 7 7 /8 18 3 /4 1 1 /2 13 3 /8 1 5 /8 3 15 /16 12 19 5 /8 19 5 /8
600 9 3 /4 9 3 /4 22 3 /8 1 1 /2 15 1 /4 1 5 /8 3 15 /16 13 7 /8 23 5 /8 23 1 /2
605 9 3 /4 9 3 /4 22 3 /8 1 1 /2 15 1 /4 1 5 /8 3 15 /16 13 7 /8 23 5 /8 23 3 /4
625 9 3 /4 9 3 /4 22 3 /8 1 1 /2 15 1 /4 1 5 /8 3 15 /16 13 7 /8 24 1 /2 24 1 /2
9

Performance Data
TDF and TDV SilentAir
TDF/TDV Models with Type V (Top Entry) Plenum
Listed Nominal Inlet
A EFF
Neck Velocity (fpm) 400 500 600 700 800 900 1000 1200 1400
Size (ft 2 )
Outlet Airflow (cfm) 140 175 210 245 280 315 350 420 490
400 8 .208
Total Pressure (in.w.g.) .040 .063 .091 .124 .162 .205 .253 .364 .496
Outlet NC

Specifications · Ordering Information
TDF and TDV Series
Suggested Specifications
TDF Series
Furnish and install TROX model TDF swirl diffusers in sizes
and quantities shown on plans and schedules. Diffuser
assembly shall include a high induction diffuser face
comprised of fixed radially aligned deflection blades.
Diffuser shall be capable of achieving an induction ratio of
at least 8 parts room air to 1 part primary air within a radius
of six (6) feet from the diffuser outlet. Diffuser shall be
capable of allowing integration into the specified ceiling
system.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated top entry
plenum with balancing damper; suitable for connection to
rigid or flexible round ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
TDV Series
Furnish and install TROX model TDV swirl diffusers in sizes
and quantities shown on plans and schedules. Diffuser
assembly shall include a high induction diffuser face
comprised of adjustable radially aligned deflection blades.
Diffuser shall be capable of achieving an induction ratio of
at least 8 parts room air to 1 part primary air within a radius
of six (6) feet from the diffuser outlet. Diffuser shall be
capable of allowing integration into the specified ceiling
system.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated
top entry plenum with balancing damper; suitable for
connection to rigid or flexible round ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
Ordering Code
TDF - Q - Z - H / 605
TEZEU
Model Number
TDF = Fixed Pattern
TDV = Adjustable Pattern
IEOEP
Nominal Size
400 ( 8 Nominal Inlet Dia.)
500 ( 8 Nominal Inlet Dia.)
600 (10 Nominal Inlet Dia.)
605 * (10 Nominal Inlet Dia.)
625 (10 Nominal Inlet Dia.)
* Fits standard 2 x 2 ceiling tile
Facial Appearance
R= Round Face
Q= Square Face
IEOEP
TEZEU
Inlet Type
V= Top Entry Plenum
(Standard)
H= Side Entry Plenum
(Optional)
11

Product Information · Application
Product Information Guide
Dimensional Information 13
Performance Data 14
Specification Text 15
Ordering Information 15
Features
• VDW series features an adjustable swirl discharge pattern.
Suitable for surface mount or lay-in.
• Incorporates adjustable pattern control elements to allow
field discharge pattern modification.
• Size 605 models are specifically designed to fit 2 x 2 lay-in
ceiling modules.
• Includes a top entry (type V) plenum box suitable for
connection to round or flexible duct. Side entry plenum
boxes (type H) are also available.
• Also available with integral HEPA filter (see page 38).
Construction
• Material: Galvanized Steel
• Finish: White powder coat paint.
VDW Series
VDW-Q Models
White control elements shown
VDW-R Models
Black control elements shown
Product Applicability
More Applicable
0 1 2 3 4 5 6 7 8 9 10
Low Temperature Air Distribution:
High Air Change Rates:
Minimal Velocity Disturbance:
High Sensible Loads:
High Ceiling Applications:
Model Availability
Mounting:
Square Face Round Face Square Face Round Face Direct Duct
(Top Entry Plenum) (Top Entry Plenum) (Side Entry Plenum) (Side Entry Plenum) Connection
Surface: VDW-Q-Z-V VDW-R-Z-V VDW-Q-Z-H VDW-R-Z-H Not Available
Lay-in: VDW-Q-Z-V/605 * Not Available VDW-Q-Z-H/605 * Not Available Not Available
Filter Terminal: See Page 38 Not Available See Page 38 Not Available Not Available
* Designed to fit standard 2 x 2 (1 inverted t-bar) ceiling modules
12

Dimensional Information
VDW Series
Size 300 x 8
Size 400 x 16
11 13 /16
11 3 /4 15 3 /4
15 11 /16
Size 500 x 24
Size 605 x 24
19 5 /8
19 11 /16 23 5 /8
23 3 /4
Size 605 x 48
Size 825 x 72
23 5 /8
23 3 /4
32 1 /2
Plenum Options
2
2
VDW - ... V Plenum
VDW - R- ... H Plenum
VDW - Q- ... H Plenum
Nominal Size Q Rø Pø K Bø Dø H 2 H 1
300 x 8 11 3 /4 11 13 /16 10 15 /16 11 7 /16 11 6 1 /4 9 7 /8 8
400 x 16 15 5 /8 15 3 /4 14 1 /4 14 11 /16 14 5 /16 7 13 /16 11 5 /8 8
500 x 24 19 5 /8 19 11 /16 18 1 /8 18 3 /4 18 3 /16 7 13 /16 11 5 /8 8
605 x 24 23 3 /4 23 5 /8 22 22 5 /16 22 9 3 /4 13 5 /8 8
605 x 48 23 3 /4 23 5 /8 22 3 /4 23 1 /4 22 9 3 /4 13 5 /8 12
825 x 72 32 1 /2 N/A N/A 31 3 /4 31 5 /16 12 5 /16 16 3 /16 N/A
13

Performance Data
VDW Series
Listed
A
Inlet
EFF
Size (ft 2 )
Neck Velocity (fpm) 600 800 1000 1200 1400 1600 1800 2000 2400
Outlet Airflow (cfm) 45 60 75 90 105 121 136 151 181
300 x 8 6 .075
Total Pressure (in.w.g.) .026 .046 .072 .104 .142 .185 .234 .289 .417
Outlet NC

Specifications · Ordering Information
VDW Series
Suggested Specifications
VDW-Q (Square Face) Models
Furnish and install TROX model VDW swirl diffusers in
sizes and quantities shown on plans and schedules.
Diffuser assembly shall include a high induction diffuser
face comprised of adjustable radially aligned deflection
blades. Diffuser shall be capable of achieving an induction
ratio of at least 8 parts room air to 1 part primary air within
a radius of six (6) feet from the diffuser outlet. Diffuser face
shall be square and capable of allowing integration into the
specified ceiling system.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated
top entry plenum with balancing damper; suitable for
connection to rigid or flexible round ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
VDW-R (Round Face) Models
Furnish and install TROX model VDW swirl diffusers in
sizes and quantities shown on plans and schedules.
Diffuser assembly shall include a high induction diffuser
face comprised of adjustable radially aligned deflection
blades. Diffuser shall be capable of achieving an induction
ratio of at least 8 parts room air to 1 part primary air within
a radius of six (6) feet from the diffuser outlet. Diffuser face
shall be round and suitable for surface or exposed duct
mounting.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated
top entry plenum with balancing damper; suitable for
connection to rigid or flexible round ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
Ordering Code
VDW - Q - Z - H / 605 x 24 / 0
Face Type
Q= Square Face
R = Round Face
Inlet Type
V= Top Entry Plenum (Standard)
H= Side Entry Plenum (Optional)
IEOEP
IEOEP
IEOEP
Control Element Color
0 Black (standard)
Q21 White (optional)
Nominal Size
300 x 8 12 Face, 8 Air Slots
400 x 16 16 Face, 16 Air Slots
500 x 24 20 Face, 24 Air Slots
605 x 24 24 Face, 24 Air Slots
605 x 48 24 Face, 48 Air Slots
825 x 72 32 Face, 72 Air Slots *
TEZEU
* Round Face Model Not Available
15

Product Information · Application
Product Information Guide
Dimensional Information 17
Performance Data 18
Specification Text 19
Ordering Information 19
Features
• Model RFD-R is designed for surface mount or exposed
duct applications.
• Model RFD-Q is designed for surface mount applications.
• RFD-R-EP models are designed for lay-in applications.
• RFD models with type K entry can be direct connected to
flexible duct. All models are also available with (type H) side
entry plenum (optional).
Construction
• Material: Galvanized Steel
• Finish: White powder coat paint.
RFD Series
Model RFD-Q
Model RFD-R
Product Applicability
More Applicable
0 1 2 3 4 5 6 7 8 9 10
Low Temperature Air Distribution:
High Air Change Rates:
Minimal Velocity Disturbance:
High Sensible Loads:
High Ceiling Applications:
Model Availability
Mounting: Square Face Round Face
Direct Duct
Connection
Side Entry Plenum
Surface: RFD-Q RFD-R RFD- __-K RFD- __-H
Lay-in: RFD-EP Not Available RFD-EP-K RFD-EP-H
Exposed Duct: Not Available RFD-R RFD-R-K RFD- R -H
16

Dimensional Information
RFD Series
Model RFD-R
Dø
R 1 ø
Model RFD-Q
Model RFD-EP
Q
Dø
Dimensions
Size Dø R 1 ø Q
125 4 7 /8 6 1 /4 7 3 /4
160 6 1 /4 7 3 /4 7 3 /4
200 7 13 /16 9 1 /2 9 3 /4
250 9 3 /4 11 5 /8 11 3 /4
315 12 3 /8 14 3 /8 15 5 /8
400 15 9 /16 17 3 /4 19 5 /8
Dø
23 3 /4
Plenum / Entry Options
K
Dø H 1
H 2
Aø
H
H 3
Type K (Standard)
Type H Plenum
Size Dø Aø K H H 1 H 2 H 3
125 4 7 /8 3 7 /8 8 1 /2 2 10 1 /4 2 1 /2 5
160 6 1 /4 4 7 /8 10 1 /2 2 1 /16 11 1 /4 2 1 /2 5
200 7 13 /16 6 1 /4 11 1 /2 2 1 /16 12 1 /2 2 1 /2 5
250 9 3 /4 7 7 /8 18 3 /4 2 14 1 /4 2 1 /2 5
315 12 3 /8 9 7 /8 22 3 /8 2 1 /16 16 1 /4 2 1 /2 5
400 15 9 /16 12 3 /8 22 1 /4 2 1 /16 19 2 1 /2 5
17

Performance Data
RFD Series
Listed Nominal Inlet A EFF
Neck Velocity (fpm) 200 300 400 500 600 700 800 900 1000
Size Diameter (in.) (ft 2 )
Outlet Airflow (cfm) 27 41 54 68 82 95 109 122 136
125 5 .037
Total Pressure (in.w.g.) .011 .024 .043 .067 .097 .132 .172 .218 .269
Outlet NC

Specifications · Ordering Information
RFD Series
Suggested Specifications
Model RFD-Q
Furnish and install TROX model RFD-Q diffusers in sizes
and quantities shown on plans and schedules. Diffuser
assembly shall include a high induction diffuser core
comprised of radially aligned deflection blades. Diffuser
shall be capable of achieving an induction ratio of at least
8 parts room air to 1 part primary air within a radius of six
(6) feet from the diffuser outlet. Diffuser face shall be
square and capable of allowing integration into a drywall
ceiling system.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated
top entry suitable for connection to rigid or flexible round
ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
Model RFD-R
Furnish and install TROX model RFD-R diffusers in sizes
and quantities shown on schedules and plan. Diffuser
assembly shall include a high induction diffuser core
comprised of radially aligned deflection blades. Diffuser
shall be capable of achieving an induction ratio of at least
8 parts room air to 1 part primary air within a radius of six
(6) feet from the diffuser outlet. Diffuser face shall be round
for integration into a drywall ceiling or mounting on an
exposed duct drop.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated
top entry suitable for connection to rigid or flexible round
ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
Ordering Code
RFD - R - H / 250
TEZEU
Model Number
RFD-Q = Square Face
(Surface Mounting)
RFD-R = Round Face
(Surface or Exposed Duct Mounting)
RFD-EP = Extended Panel
(Lay -in Mounting in 24 x 24 Tile)
TEZEU
Nominal Size *
125 ( 5 Nominal Inlet Dia.)
160 ( 6 Nominal Inlet Dia.)
200 ( 8 Nominal Inlet Dia.)
250 (10 Nominal Inlet Dia.)
315 (12 Nominal Inlet Dia.)
400 (16 Nominal Inlet Dia.)
* When furnished with Type K inlet
(standard)
Inlet Type
K= No Plenum (Standard)
H= Side Entry Plenum (Optional)
IEOEP
19

Product Information · Application
Product Information Guide
Dimensional Information 21
Performance Data 22
Specification Text 23
Ordering Information 23
Features
• RFD- .. -D series diffusers incorporate a bell mouth discharge
for enhanced perfomance and aesthetics.
• Model RFD-R-D is designed for surface mount or exposed
duct applications.
• Model RFD-Q-D is designed for surface mount applications.
• RFD-EP-D models are designed for lay-in applications.
• Models with type K entry can be direct connected to flexible
duct. RFD-R-D and RFD-Q-D models are also available with
type H side entry plenums (optional).
Construction
• Material: Galvanized Steel
• Finish: White powder coat paint.
RFD-..-D Series
Model RFD - R - D
Model RFD - EP - D
Product Applicability
More Applicable
0 1 2 3 4 5 6 7 8 9 10
Low Temperature Air Distribution:
High Air Change Rates:
Minimal Velocity Disturbance:
High Sensible Loads:
High Ceiling Applications:
Model Availability
Mounting: Square Face Round Face
Direct Duct
Connection
Side Entry Plenum
Surface: RFD-Q-D RFD-R-D RFD- _-D-K RFD- _-D-H
Lay-in: RFD-EP-D Not Available RFD-EP-D-K RFD-EP-D-H
Exposed Duct: Not Available RFD-R-D-K RFD-R-D-K Not Applicable
20

Dimensional Information
RFD-D Series
Model RFD-R-D
Dø
R 1 ø
Model RFD-Q-D
Model RFD-EP-D
Q
Dø
Dimensions
Size Dø R 1 ø Q
125 4 7 /8 8 7 3 /4
160 6 1 /4 10 9 3 /4
200 7 13 /16 12 9 3 /4
250 9 3 /4 13 3 /4 11 3 /4
315 12 3 /8 17 3 /4 15 5 /8
400 15 9 /16 22 7 /8 19 5 /8
Dø
23 3 /4
Plenum / Entry Options
K
Dø H 1
H 2
Aø
H
H 3
Type K (Standard)
Type H Plenum
Size Dø Aø K H H 1 H 2 H 3
125 4 7 /8 3 7 /8 8 1 /2 2 15 /16 11 1 /4 3 1 /2 6 1 /8
160 6 1 /4 4 7 /8 10 1 /2 3 1 /16 12 1 /4 3 1 /2 6 1 /8
200 7 13 /16 6 1 /4 11 1 /2 3 1 /16 13 1 /2 3 1 /2 5 7 /8
250 9 3 /4 7 7 /8 18 3 /4 2 15 /16 15 1 /4 3 1 /2 6 1 /8
315 12 3 /8 9 7 /8 22 3 /4 3 1 /2 17 1 /2 3 7 /8 6 1 /2
400 15 9 /16 12 3 /8 24 1 /4 3 1 /2 20 1 /16 3 7 /8 6 1 /2
21

Performance Data
RFD-D Series
Listed Nominal Inlet A EFF
Neck Velocity (fpm) 200 300 400 500 600 700 800 900 1000
Size Diameter (in.) (ft 2 )
Outlet Airflow (cfm) 27 41 54 68 82 95 109 122 136
125 5 .037
Total Pressure (in.w.g.) .011 .024 .043 .067 .097 .132 .172 .218 .269
Outlet NC

Specifications · Ordering Information
RFD-...-D Series
Suggested Specifications
Model RFD-Q-D
Furnish and install TROX model RFD-Q-D diffusers in sizes
and quantities shown on plans and schedules. Diffuser
assembly shall include a high induction diffuser core comprised
of radially aligned deflection blades. Diffuser shall be
capable of achieving an induction ratio of at least 8 parts
room air to 1 part primary air within a radius of six (6) feet
from the diffuser outlet. Diffuser discharge shall be a
bellmouth configuration designed to maximize room air
induction. Diffuser face shall be square and capable of
allowing integration into a drywall ceiling system.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated
top entry suitable for connection to rigid or flexible round
ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
Model RFD-R-D
Furnish and install TROX model RFD-R-D diffusers in sizes
and quantities shown on schedules and plan. Diffuser
assembly shall include a high induction diffuser core comprised
of radially aligned deflection blades. Diffuser shall be
capable of achieving an induction ratio of at least 8 parts
room air to 1 part primary air within a radius of six (6) feet
from the diffuser outlet. Diffuser discharge shall be a
bellmouth configuration designed to maximize room air
induction.Diffuser face shall be round for integration into a
drywall ceiling or mounting on an exposed duct drop.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated
top entry suitable for connection to rigid or flexible round
ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
Ordering Code
RFD - R - D - H / 250
TEZEU
Model Number
RFD-Q-D = Square Face
(Surface Mounting)
RFD-R-D = Round Face
(Surface or Exposed Duct Mounting)
RFD-EP-D = Extended Panel
(Lay -in Mounting in 24 x 24 Tile)
TEZEU
Nominal Size *
125 ( 5 Nominal Inlet Dia.)
160 ( 6 Nominal Inlet Dia.)
200 ( 8 Nominal Inlet Dia.)
250 (10 Nominal Inlet Dia.)
315 (12 Nominal Inlet Dia.)
400 (16 Nominal Inlet Dia.)
* When furnished with Type K inlet
(standard)
Inlet Type
K= No Plenum (Standard)
H= Side Entry Plenum (Optional)
IEOEP
23

Product Information · Application
Product Information Guide
Dimensional Information 25
Performance Data 26
Specification Text 27
Ordering Information 27
Features
• Designed for lay-in ceiling applications.
• DCS-P models feature a perforated face with a concealed
swirl technology core.
• DCS-C models feature a recessed perforated core plate and
a high efficiency discharge nozzle.
• DCS-P-K and DCS-C-K models allow direct connection to
flexible duct.
•Available with (optional) side entry plenum (Type H).
Construction
• Material: Galvanized Steel
• Finish: Perforated face, white powder coat paint.
All other parts, flat black paint.
DCS Series
DCS-P
DCS-C
Product Applicability
More Applicable
0 1 2 3 4 5 6 7 8 9 10
Low Temperature Air Distribution:
High Air Change Rates:
Minimal Velocity Disturbance:
High Sensible Loads:
High Ceiling Applications:
Model Availability
Mounting: Square Face Round Face Top Entry Plenum Side Entry Plenum
Direct Duct
Connection
Surface: Not Available Not Available Not Available Not Available Not Available
Lay-in: DCS- .. -..... Not Available Not Available DCS- ... -H DCS- ... -K
Exposed Duct: Not Available Not Available Not Available Not Available Not Available
24

Dimensional Information
DCS Series
Model DCS-P
23.75
Model DCS-C
23.75
Plenum / Entry Options
K
Dø
H 1
Aø
H
H 2
H 3
Type K (Standard)
Type H Plenum
Size Dø Aø K H H 1 H 2 H 3
125 4 7 /8 3 7 /8 8 3 9 1 /8 3 4 1 /8
160 6 1 /4 4 7 /8 9 3 /8 3 10 1 /4 3 4 1 /4
200 7 13 /16 6 1 /4 10 7 /8 3 11 5 /8 3 4 1 /4
250 9 3 /4 7 7 /8 12 7 /8 3 13 3 4 1 /8
315 12 3 /8 9 7 /8 15 1 /2 3 1 /2 15 1 /2 3 1 /2 4 5 /8
400 15 9 /16 12 3 /8 18 3 /4 3 1 /2 17 3 /4 3 1 /2 5 3 /8
25

Performance Data
DCS-P and DCS-C Series
Listed Nominal Inlet A EFF
Neck Velocity (fpm) 200 300 400 500 600 700 800 900 1000
Size Diameter (in.) (ft 2 )
Outlet Airflow (cfm) 27 41 54 68 82 95 109 122 136
125 5 .037
Total Pressure (in.w.g.) .011 .024 .043 .067 .097 .132 .172 .218 .269
Outlet NC

Specifications · Ordering Information
Suggested Specifications
DCS - P Series
Furnish and install TROX model DCS-P perforated face
swirl diffusers in sizes and quantities shown on plans and
schedules. Diffuser assembly shall include a high induction
diffuser core comprised of radially aligned deflection
blades. Diffuser shall be capable of achieving an induction
ratio of at least 8 parts room air to 1 part primary air within
a radius of six (6) feet from the diffuser outlet. Perforated
diffuser face shall be square and fabricated from 51
percent free area perforated plate. Diffuser assembly shall
be compatible for lay-in installation in a standard (1 inch
inverted T-bar) ceiling suspension system.
The diffuser shall be constructed of steel and its face
finished in powder coated paint (RAL 9010, white) or (color
specified by architect). All internal surfaces are to be
painted RAL 9005 (flat black).
(Type H Horizontal Plenum, Optional) Diffuser shall be
furnished with a factory fabricated side entry plenum
assembly consisting of a round inlet collar and an airflow
equalizing grid. This plenum assembly shall be constructed
of galvanized steel.
DCS - C Series
Furnish and install TROX model DCS-C swirl diffusers in
sizes and quantities shown on plans and schedules.
Diffuser assembly shall include a high induction diffuser
core comprised of radially aligned deflection blades and a
high efficiency bell mouth discharge nozzle. Diffuser shall
be capable of achieving an induction ratio of at least
8 parts room air to 1 part primary air within a radius of
six (6) feet from the diffuser outlet. Perforated diffuser face
shall be fabricated from 51 percent free area perforated
plate. Diffuser assembly shall be compatible for lay-in
installation in a standard (1 inch inverted T-bar) ceiling
suspension system.
The diffuser shall be constructed of steel and its face
finished in powder coated paint (RAL 9010, white) or (color
specified by architect). All internal surfaces are to be
painted RAL 9005 (flat black).
(Type H Horizontal Plenum, Optional) Diffuser shall be
furnished with a factory fabricated side entry plenum
assembly consisting of a round inlet collar and an airflow
equalizing grid. This plenum assembly shall be constructed
of galvanized steel.
Ordering Code
DCS - P - K / 250
Model Number
DCS - P
DCS - C
IEOEP
TEZEU
Nominal Size *
125 ( 5 Nominal Inlet Dia.)
160 ( 6 Nominal Inlet Dia.)
200 ( 8 Nominal Inlet Dia.)
250 (10 Nominal Inlet Dia.)
315 (12 Nominal Inlet Dia.)
400 (16 Nominal Inlet Dia.)
* With type K (standard) inlet
Inlet Type
K= No Plenum (Standard)
H= Horizontal Entry Plenum (Optional)
IEOEP
27

Product Information · Application
Product Information Guide
Dimensional Information 29
Performance Data 32
Specification Text 33
Ordering Information 33
Features
• Designed for exposed duct applications.
• VDL models incorporate swirl performance on cooling while
providing maximum vertical throw during heating.
• Optional electric operators allow remote reset or automatic
control of diffuser discharge pattern, allowing horizontal discharge
during cooling operation and vertical spot projection
of heated air.
•Available with top or side entry plenum boxes.
Construction
• Material: Galvanized Steel
• Finish: White Powder Coat Paint
VDL Series
For High Ceiling Heating and Cooling Applications
VDL in Cooling Mode
VDL in Heating Mode
Product Applicability
More Applicable
0 1 2 3 4 5 6 7 8 9 10
Low Temperature Air Distribution:
High Air Change Rates:
Minimal Velocity Disturbance:
Heating and Cooling Applications:
High Ceiling Applications:
Model Availability
Mounting / Options:
VDL Series VDL Series VDL Series
No Plenum Top Entry Plenum Side Entry Plenum
Surface Mount: Not Recommended Not Recommended Not Recommended
Lay-in: Not Available Not Available Not Available
Exposed Duct:
(Manual Adjustment)
VDL Not Available Not Available
Exposed Duct: VDL - E2 or VDL-V- E2 or
(Electric Operator) VDL - E3 VDL-V-E3
Not Available
Motorized options incorporate 24VAC electric motors. E2 and E3 options provide two position and proportional control of discharge pattern (respectively).
28

Dimensional Information
VDL Series
Dimensions
K
2 5/8
Bø
Dø
Dø
H 3
H 4
Bø
H 1
T
T
Rø
Model VDL - H...
Rø
Model VDL - V...
Bø
C R 2
T
H 2
Rø
Duct Mating Flange for VDL
Model VDL...
Size Dø Rø Bø H 1 H 2 H 3 H 4 T R 2 C
315 9 3 /4 18 1 /4 12 1 /2 16 3 /4 8 19 13 1 /2 2 1 /2 15 14 1 /2
400 12 3 /8 22 5 /16 15 7 /8 21 9 3 /8 23 3 /4 16 9 /16 3 1 /8 18 1 /4 17 3 /4
630 15 3 /4 34 1 /4 25 29 1 /2 15 1 /16 33 3 /8 24 1 /4 4 15 /16 27 7 /8 27 3 /16
800 19 3 /4 42 3 /8 31 5 /8 39 5 /16 22 3 /8 44 5 /8 33 1 /2 6 5 /16 34 5 /16 33 9 /16
Suggested Mounting
Model VDL Model VDL - V Model VDL - H
29

Product Information · Application
Product Information Guide
Dimensional Information 31
Performance Data 32
Specification Text 33
Ordering Information 33
Features
• Designed for surface mount and exposed duct applications
involving high ceilings.
• VDZ models incorporate swirl performance on cooling while
providing maximum vertical throw during heating.
• Optional electric operators allow remote reset or automatic
control of diffuser discharge pattern, allowing horizontal discharge
during cooling operation and vertical spot projection
of heated air.
• Unlike VDL, facial appearance is same for all discharge
positions.
•Available with top or side entry plenum boxes.
Construction
• Material: Galvanized Steel
• Finish: White Powder Coat Paint
VDZ Series
For High Ceiling Heating and Cooling Applications
Product Applicability
More Applicable
0 1 2 3 4 5 6 7 8 9 10
Low Temperature Air Distribution:
High Air Change Rates:
Minimal Velocity Disturbance:
Heating and Cooling Applications:
High Ceiling Applications:
Model Availability
Mounting / Options:
VDZ Series VDZ- V Series VDZ- H Series
No Plenum Top Entry Plenum Side Entry Plenum
Surface Mount:
(Manual Adjustment)
VDZ-B-NV VDZ-B-V VDZ-B-H
Surface Mount: VDZ-B-NV- E2 or VDZ-B-V- E2 or VDZ-B-H- E2 or
(Electric Operator) VDZ-B-NV-E3 VDZ-B-V-E3 VDZ-B-H-E3
Exposed Duct:
(Manual Adjustment)
VDZ-A-NV VDZ-A-V VDZ-A-H
Exposed Duct: VDZ-A-NV- E2 or VDZ-A-V- E2 or VDZ-A-H- E2 or
(Electric Operator) VDZ-A-NV-E3 VDZ-A-V-E3 VDZ-A-H-E3
Motorized options incorporate 24VAC electric motors. E2 and E3 options provide two position and proportional control of discharge pattern (respectively).
30

Dimensional Information
VDZ Series
Dimensions
øD 3
K
H 4
C 2
H 3
øD 1
H 2
øD 2
øD 2
Model VDZ...NV
Model VDZ...H
øD 1
C 1
H 1
A
øD 2
Exposed Mounting Detail
øD 2
Model VDZ...V
A
øD 2
Surface Mounting Detail
Size øD 1 øD 2 øD 3 H 1 H 2 H 3 H 4 C 1 C 2 A
315 9 3 /4 18 1 /4 12 3 /8 18 1 /2 11 20 3 /4 9 7 /16 2 1 /4 2 1 /4 1 5 /8
400 12 3 /8 22 5 /16 15 3 /4 22 7 /8 14 3 /8 25 1 /2 11 2 1 /4 3 1 /2 1 3 /4
630 15 3 /4 34 5 /16 24 3 /4 31 1 /2 18 5 /16 32 13 7 /16 3 1 /2 3 1 /2 2
800 19 3 /4 42 7 /16 31 7 /16 36 7 /8 22 1 /4 38 1 /4 15 3 /4 3 1 /2 3 1 /2 2 3 /16
Suggested Mounting
Model VDZ...NV Model VDZ...V Model VDZ...H
31

Performance Data
Models VDL and VDZ
Listed Nominal Inlet
A EFF
Neck Velocity (fpm) 800 1000 1200 1400 1600 1800 2000 2200 2400
Size (ft 2 )
Outlet Airflow (cfm) 234 293 351 410 468 527 585 644 702
Total Pressure (in.w.g.) .057 .090 .129 .176 .230 .291 .359 .434 .517
315 10 .293 Outlet NC 17 21 25 29 32 36 40 44 48
Horizontal Throw (ft.) 1-1-2 1-1-2 1-1-3 1-1-3 1-2-3 1-2-4 1-2-4 2-3-5 2-3-5
Max. Vertical Throw (ft.) 5 6 8 9 11 13 14 16 18
Outlet Airflow (cfm) 439 549 659 768 878 988 1098 1207 1317
Total Pressure (in.w.g.) .038 .060 .086 .117 .153 .194 .239 .289 .344
400 12 .549 Outlet NC

Specifications · Ordering Information
VDL and VDZ Series
Suggested Specifications
VDL Series
Furnish and install TROX model VDL swirl diffusers in sizes
and quantities shown on plans and schedules. Diffuser
assembly shall include a high induction diffuser face comprised
of radially aligned deflection blades. Diffuser shall be
capable of achieving an induction ratio of at least 8 parts
room air to 1 part primary air within a radius of six (6) feet
from the diffuser outlet. Diffuser shall incorporate a
(manual, automatic) adjustment to facilitate a vertical jet
discharge when in its heating mode and a horizontal swirl
discharge during cooling operation.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated plenum
with top entry suitable for connection to exposed rigid or
flexible round ductwork.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel.
VDZ Series
Furnish and install TROX model VDZ swirl diffusers in sizes
and quantities shown on plans and schedules. Diffuser
assembly shall include a high induction diffuser face comprised
of radially aligned deflection blades. Diffuser shall be
capable of achieving an induction ratio of at least 8 parts
room air to 1 part primary air within a radius of six (6) feet
from the diffuser outlet. Diffuser shall incorporate a
(manual, automatic) adjustment to facilitate a vertical jet
discharge when in its heating mode and a horizontal swirl
discharge during cooling operation.
The diffuser shall be constructed of steel and powder coat
finish in (RAL 9010, white) or (color specified by architect).
Diffuser shall be furnished with a factory fabricated
plenum with top entry suitable for connection to rigid or
flexible round ductwork in exposed duct or surface mount
applications.
Optional Type H Side Entry Plenum
Diffuser shall be furnished with a factory fabricated side
entry plenum assembly consisting of a round inlet collar
with an integral balancing damper and an airflow equalizing
grid. This plenum assembly shall be constructed of
galvanized steel. Note: Plenum must be installed before
ceiling when mounted in drywall!
Ordering Code
VDZ - B - H
/
630 - E2
Model Number
VDL = Adjustable Pattern
(Varying Facial Appearance)
VDZ = Adjustable Pattern
(Constant Facial Appearance)
TEZEU
IEOEP
Operator/Positioner
M = Manual (No Actuator)
E2 = Electric (24VAC, 2 Position)
E3 = Electric (24VAC, Proportional)
Flange Type (VDZ Models Only)
A= None
(Exposed Duct Applications)
B= Flush Mounting Angle
(Surface Mount Applications)
Plenum/Inlet Type
V= Top Entry Plenum (Standard)
H= Side Entry Plenum (Optional)
TEZEU
IEOEP
TEZEU
Nominal Size
315 (10 Nominal Inlet Dia.)
400 (12 Nominal Inlet Dia.)
630 (16 Nominal Inlet Dia.)
800 (20 Nominal Inlet Dia.)
33

Applications
Swirl Diffusers in High Air Change Applications
The unique operational characteristics of swirl diffusers makes
them the ideal choice for high load and air change rate applications.
Figure 1 illustrates a collision between two air streams
from conventional ceiling diffusers. The velocity measured at
height (H) is dependent upon the distance (X) between the diffusers
and increases as that distance between is reduced. This
relationship is depicted in Figure 2. Although their projection is
significantly less, swirl diffusers operate in a similar manner
when located far enough apart that their radial swirl fields do not
intersect. The performance data in previous sections of this
leaflet is based on such spacing.
However, when the diffusers are located such that their swirl
fields intersect (see figure 3), a secondary swirl field is formed
which increases the induction of room air. As such, room
velocities can actually be reduced by locating the diffusers in
very close proximity to one another. This should be limited to
a single direction and 8 to 10 feet spacing maintained in the
perpendicular direction (see figure 4 below).
Swirl diffusers can be employed to deliver air change rates
in excess of 80 per hour, while maintaining minimal velocity
disturbances in the occupied or process areas of the space.
Performance data presented on pages 36 and 37 (and the
examples on page 35) aid designers in selecting swirl diffusers
for high air change applications. TROX also provides designers
with selection and location software supporting high air change
applications. Contact your local TROX representative for further
details.
X
Conventional
Diffuser
X/2
H 1
Midpoint
Velocity
Velocity at Midpoint
Swirl
Diffuser
Diameter of
Swirl Field
Distance (X) Between Diffusers
Figure 1: Multiple Diffusers in a Space
Figure 2: Diffuser Characteristics
Secondary
Swirl
8-10 ft.
3-6 ft.
Swirl Field
Figure 3: Intersection of Swirl Fields
Figure 4: High Density Mounting For High Air Change Rates
34

Diffuser Selection · Examples
High Air Change Selection Procedure
Swirl diffusers for high air change applications may be
identified and selected according to the following procedures:
1. Identify the air change rate and maximum allowable
velocity for the application under consideration.
2. Identify the types and sizes of swirl diffusers that are
capable of the specified performance using the table on
page 36.
3. After identifying diffuser type and size, consult the table
on page 37 to determine the maximum outlet airflow
rate that corresponds to the desired performance.
4. Calculate the required number of diffusers for the application,
rounding up to the next number that results in an
equal diffuser distribution in each row For example, if
three rows (but onlyseven outlets) are required, increase
the number of outlets to maintain equal distribution. If a
single row (of seven outlets) is involved, the calculated
number of outlets is sufficient. Each outlet handles the
same CFM.
5. Locate diffusers in an array such that the distance from
any wall to the center of the nearest diffuser is at least
3 feet. Diffuser spacing may be anywhere from 3 to
6 feet in one direction, while the perpendicular spacing
is limited to at least eight (8) feet. Note that maximum air
change capacities on page 36 are based on a 3 ft by 8 ft
spacing and may be reduced as spacing is increased.
8 ft.
3 ft.
3 ft
(min)
Diffuser Layout for High Air Change Applications
3 ft
(min)
High Air Change Selection Example 1:
TDF (size 605) swirl diffusers are to be used in a laboratory
with nine (9) foot ceilings. The space (16 ft x 15 ft) requires
40 ACH-1 (1440 CFM) and velocities at the top of the hood
sash (6 foot level) cannot exceed 50 fpm.
A quick check verifies that the maximum air change rate
(page 36) for a TDF/605 installed 3 feet above the level
where velocities are limited to 50 fpm is 58.
Airflow data for the TDF/605 (see page 37) indicates that
the maximum outlet airflow that may be employed while
limiting velocities (3 feet below the diffuser) to 50 fpm is
240 CFM. Therefore, 6 diffusers must be used, handling
240 CFM each and located as shown.
8 ft.
3.5 ft
3 ft.
Layout for Example 1
5 ft.
High Air Change Selection Example 2:
VDW (size 605 x 48) swirl diffusers are to be used in a
clean room with a nine (9) foot ceiling. The space
(15 ft x 14 ft) requires 70 ACH-1 (2205 CFM) and velocities
at the 6 foot level cannot exceed 60 fpm.
A check verifies that the maximum air change rate (page
36) for the selected diffuser installed 3 feet above the level
where velocities are limited to 60 fpm is 74.
Airflow data (page 37) for the VDW (size 605 x 48)
indicates that the maximum outlet airflow that may be
delivered while limiting velocities (3 feet below the diffuser)
to 60 fpm is 305 CFM, so 8 diffusers must be used,
handling 275 CFM each and located as shown.
8 ft.
3 ft.
3 ft
(min)
3 ft
(min)
Layout for Example 2
35

High Air Change Applications
Maximum Air Change Rate Capacities
Distance H 1
(feet)
Maximum
Diffuser Model/Size
Velocity
RFD RFD-D RFD RFD RFD-D TDF/TDV VDW RFD-D TDF/TDV VDW TDF/TDV VDW
(fpm)
250 250 315 400 315 400 500 x 24 400 500 605 x 24 605 605 x 48
50 18 25 25 30 33 33 37 38 40 45 48 52
60 20 29 29 35 38 38 44 44 46 53 55 60
2 70 25 33 33 40 44 46 50 50 53 60 63 68
80 27 37 37 45 49 49 56 56 59 67 70 76
100 33 44 45 55 59 59 68 68 71 More than 80
50 22 30 32 38 40 40 46 47 48 56 58 64
60 27 35 36 44 47 47 55 55 57 64 68 74
3 70 30 40 41 50 53 53 62 62 64 74 78 >80
80 34 45 47 56 61 61 69 69 72 More than 80
100 40 55 57 67 73 73 More than 80
50 26 35 36 43 46 46 53 53 56 63 67 73
60 29 40 43 49 53 53 62 62 64 74 77 >80
4 70 34 46 48 57 62 61 71 71 74 More than 80
80 38 51 53 63 69 69 More than 80
100 46 62 64 76 More than 80
50 28 38 40 47 51 51 59 59 60 69 72 79
60 33 45 46 54 54 59 68 68 70 More than 80
5 70 38 51 53 61 67 66 77 77 MMore than 80
80 42 57 59 68 75 74 More than 80
100 50 68 70 More than 80
50 29 41 42 49 54 54 62 63 65 74 77 >80
60 35 47 49 57 63 63 73 73 75 More than 80
6 70 38 51 53 61 67 66 77 77 More than 80
80 45 61 62 74 More than 80
100 54 73 75 More than 80
50 31 43 44 52 56 56 66 66 68 77 More than 80
60 37 50 51 60 66 65 76 76 79 More than 80
7 70 42 56 59 69 76 75 More than 80
80 47 63 65 77 More than 80
100 56 76 79 More than 80
Notes Regarding Table:
1. Values listed above represent maximum achievable air change rates for diffusers spaced on three (3) foot centers in
one direction and eight (8) foot centers in a perpendicular direction. The tabulation also assumes a minimum of three (3)
feet from any vertical wall or boundary to the closest outlet.
2. For air change rates exceeding 80, contact the factory for application guidance.
36

High Air Change Applications
Maximum Diffuser Airflow Rates
Maximum
Diffuser Model/Size
Distance H 1
Velocity
(feet)
RFD RFD RFD RFD-D RFD-D RFD-D TDF/TDV TDF/TDV TDF/TDV VDW VDW VDW
(fpm)
250 315 400 250 315 400 400 500 605 500 x 24 605 x 24 605 x 48
50 65 90 110 90 120 140 120 145 175 135 165 190
60 75 105 130 105 140 160 140 170 200 160 195 225
2 70 90 120 145 120 160 185 170 195 230 185 220 250
80 100 135 165 135 180 205 180 215 255 205 245 280
100 120 165 200 160 215 250 215 260 310 240 295 345
50 90 130 155 125 165 195 165 200 240 190 230 265
60 110 150 180 145 195 225 195 235 280 225 265 305
3 70 125 170 205 165 220 255 220 265 320 255 305 350
80 140 195 230 185 250 285 250 295 355 285 340 390
100 165 235 275 225 300 345 300 360 425 345 410 470
50 120 165 195 160 210 245 210 255 305 245 290 335
60 135 195 225 185 245 285 245 295 355 285 340 390
4 70 155 220 260 210 285 325 280 340 405 325 385 445
80 175 245 290 235 315 365 315 375 450 365 430 495
100 210 295 350 285 380 440 380 455 545 440 520 600
50 140 200 235 190 255 295 255 305 365 295 350 400
60 165 230 270 225 295 345 295 355 425 345 410 470
5 70 190 265 310 255 340 390 335 405 485 390 465 530
80 210 295 345 285 380 440 375 455 545 435 520 595
100 250 355 420 345 450 530 455 550 600 525 625 720
50 160 230 270 225 295 345 295 355 425 340 405 465
60 190 270 315 260 345 400 345 415 495 400 475 540
6 70 220 305 360 295 395 455 390 470 565 455 540 620
80 245 340 405 335 440 510 440 530 630 510 600 690
100 295 415 485 400 535 615 530 640 765 615 730 835
50 185 260 310 255 335 390 335 405 480 390 460 530
60 220 305 360 295 395 455 390 470 565 455 535 620
7 70 250 350 410 335 450 520 445 535 640 515 615 700
80 280 390 460 375 500 580 500 600 720 575 685 790
100 335 470 555 455 605 700 600 725 870 700 825 950
Notes Regarding Table:
1. Airflow rates shown represent the maximum allowable diffuser delivery that limits local velocities to (or below) the
prescribed velocity at the appropriate distance (H 1 ) below the diffuser discharge.
2. These maximum air flow rates are based upon a minimum three (3) foot diffuser spacing in one direction and an eight (8)
foot spacing in the perpendicular direction.
37

Product Information
High Efficiency Filter Terminals
Features
• Swirl diffuser performance suitable for use in clean rooms
up to Class 1000.
• Integral filters offer particulate filtration efficiencies as
high as 99.998%.
•Welded airtight plenum box includes a pressure test port
and an oil mist injection port.
• All terminals allow filter service through diffuser face.
High efficiency filter
Diffuser face (VDW shown)
Gel seal
Face removal screw
Construction
• Material: Galvanized Steel
•Diffuser Finish: White powder coat paint.
F660 Series
F640 Series
F655 Series
Models Available
F660 Series Filter Terminals
F660 series terminals incorporate a top entry collar and
are intended for flush ceiling mounting. These terminals
incorporate any of the high efficiency filters shown below,
and are offered with either TDF or VDW swirl diffuser faces.
Sizes are available for terminal airflow rates as high as
625 CFM (based on a 1.0 in.w.g. clean filter pressure
requirement).
F640 Series Filter Terminals
F640 series terminals incorporate a side entry collar and
are intended for flush ceiling mounting. These terminals
incorporate any of the high efficiency filters shown below,
and are offered with either TDF or VDW swirl diffuser
faces. Sizes are available for terminal airflow rates as high
as 625 CFM (based on a 1.0 in.w.g. clean filter pressure
requirement).
F655, F656 and F657 Series Terminals
F655 and F656 series terminals also incorporate a side
entry collar but include an integral motorized shut-off
damper. This allows filter service without effect to the airflow
supply to other terminals. In addition, it may be used
to shut-off selected terminals during unoccupied periods in
order to increase filter life and conserve fan energy.
F657 terminals incorporate a mechanical volume regulator
which compensates for filter loading and maintains a
constant volume airflow through the terminal. No external
power or control connections are required.
All terminals are offered with either TDF or VDW swirl
diffuser faces. Sizes are available for terminal airflow rates
as high as 625 CFM (based on a 1.0 in.w.g. clean filter
pressure requirement).
Filter Availability
Filter Type
Efficiency
Initial Pressure
Filter Model for Filter Model for Filter Model for Filter Model for
Seal Type
Loss (in.w.g.) Size B Terminal Size C Terminal Size D Terminal Size E Terminal
F780Z >98% 0.50 U Channel Gasket F780Z13 F780Z46 F780Z49 F780Z02
F781U >99.997 % 1.0 Gel Seal F781U13 F781U46 F781U49 F781U02
F780 filter changeout is recommended when pressure drop exceeds 1.2 in.w.g.
F781 filter changeout is recommended when pressure drop exceeds 2.5 in.w.g.
38

Dimensional Information
High Efficiency Filter Terminals
F660 Series F640 Series F655, F656 and
F657 Series
Terminal Maximum Filter Size
Size CFM (mm)
B øD H J K
B 360 457 x 457 x 78 18 7 /8 5 7 /8 19 20 1 /16 20 3 /8
C 500 535 x 535 x 78 22 7 7 /8 22 1 /16 23 1 /8 23 1 /2
D 575 575 x 575 x 78 23 9 /16 7 7 /8 23 11 /16 24 3 /8 24 1 /2
E 650 610 x 610 x 78 24 15 /16 7 7 /8 25 1 /16 26 1 /8 26 5 /8
Detail X
Ordering Code
F656 - T - 1 - C
/
F781
Model Number
F640 = Filter Terminal, Top Entry
F655 = Filter Terminal, Side Entry
(Pneumatic Shut Off Damper)
F656 = Filter Terminal, Side Entry
(24VAC Shut Off Damper)
F657 = Filter Terminal, Side Entry
(Constant Volume Regulator)
F660 = Filter Terminal, Side Entry
(No Airflow Controller)
TEZEU
IEOEP
TEZEU
Filter Type
F780
F781
Unit Size
B
C
D
E
Diffuser Face
T= TDF-Q
V= VDW-Q
IEOEP
39

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Telefax: (770) 569-1435 Telefax 49 28 45/2 02-2 65
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Design changes reserved · All rights reserved © Gebrüder Trox GmbH (12/2002)
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