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and other areas where there are normally high levels of fumes,
smoke or dust i.e. places where Smoke Alarms cannot be
installed without the risk of excessive nuisance alarms.
A Heat Alarm should only be used in a room adjoining an escape
route, in conjunction with Smoke Alarms on the escape routes.
All the Heat Alarms and Smoke Alarms should be interconnected
to ensure the early warning will be heard, particularly by
somebody sleeping. A properly designed early warning fire
system ensures the alarm is given before the escape routes
become blocked with smoke. Therefore there must be Smoke
Alarms along the escape routes as Heat Alarms would not give
sufficient warning. However, a fire in a closed room (e.g. kitchen)
adjoining the escape route, can eventually cause the corridor to
become smoke-logged due to smoke leaking out from around the
door before adequate warning can be given by detectors in the
corridor. (Smoke leaking out from a room is often cool and slow
moving so it can take a long time to rise to the ceiling, and travel
to a detector which could be some distance away). A Heat Alarm
in the closed room may give early warning of fire in that room and
help overcome this problem.
The Heat Alarm must be interconnected to the other alarms.
Figure 2 illustrates where Heat Alarms and Smoke Alarms should
be located in a typical two storey house. Note the spacings in
"Recommended Protection" which ensure the early detection of
fire and that warning will be heard.
Locate Heat Alarms in rooms adjoining or on escape routes -
kitchens, garages, boiler houses etc. where Smoke Alarms are
unsuitable. Install within 5.3m (17 feet) of potential sources of fire.
4
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