CAICE Attenuator

Types of Fire Rated System
Intended use
When considering fire-rated systems, it is important to identify
the intended use of the system under emergency conditions.
An Operational System is one that must remain capable of
operating under emergency conditions (e.g. smoke extract
systems).
A Non-Operational System is one that is designed for
containment purposes and does not need to be operational
under emergency conditions (e.g. kitchen extract).
Period of Protection
The majority of operational systems are usually rated for a
temperature of 300 o C, although some systems can be rated at
400 o C. Typical timescales for operation at this temperature
would be 2 hours. For an operational system, the rating of the
ductwork should match or exceed the rating of the fan.
Non-operational systems may be required to withstand higher
temperatures and/or longer time periods.
Stability, Integrity and Insulation
The “stability” of a system refers to its ability to retain its position,
shape and form for a given time.
The “Integrity” of a system refers to the fire-stopping properties
(e.g. through structural penetrations).
“Insulation” is applied to a system to minimise the effect of
radiant heat.
Fire Rated Attenuator Options
Caice/Flameshield Standard Fire-Rated Attenuators
All Caice/Flameshield standard fire rated attenuators would be
suitable for use in operational smoke extract systems with a
rating up to 300 o C for 2 hours.
Enhanced Fire-ratings
Where attenuators are to be installed in any of the following firerated
systems, please contact us for further details as the
products will require an enhanced construction:
Kitchen Extract
Stair Pressurisation
Smoke Extract in excess of 300°C / 2hours
Other fire-rated rectangular ventilation duct systems
Circular Attenuators
Circular attenuators are not suitable for use in Flameshield fire
rated ductwork systems.
Compatibility with other fire-rated systems
We are aware that some other manufacturers of specialist firerated
ductwork systems may be reluctant to approve the use of
Caice/Flameshield attenuators in their systems, stating either
aesthetic or technical reasons. However, there is no technical
reason why Caice/Flameshield attenuators cannot be used in
other systems.
As various fire-rated systems may differ in appearance and
construction, it is suggested that approval is sought from the
relevant parties before installing Caice/Flameshield attenuators
in any other fire rated system.
In the event that Caice / Flameshield attenuators are not
approved for use, then Caice can offer attenuator products to
match the constructional requirements of any other fire-rated
system at additional cost.
www.caice.co.uk
CAICE Attenuator Brochure
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