2.2 Selecting Alarm Type
1
Optical Smoke Alarms are recommended due to their
excellent response to smouldering fires. If there is likely to be
problems with steam, contamination or dust build-up, or if there
is significant risk of a fast burning clean fire an Ionisation Smoke
Alarm should be fitted.
2
Some Fire Authorities recommend that both Ionisation and
Optical Smoke Alarms should be fitted for the fastest response
to all types of fires.
3
Some Fire authorities (concerned with the slow response of
Heat Alarms) advise that Smoke Alarms should be fitted. This
is acceptable according to BS 5839-6 provided there are clearly
not going to be problems with nuisance alarms. Fit Heat Alarms
only if nuisance alarms are very likely and it is acceptable that
a warning will only be given by the Heat Alarm when there
is a very significant flaming fire in the room. If the door(s)
and windows are not closed to contain the fire and heat, it is
extremely unlikely that the Heat Alarm would respond before a
Smoke Alarm sited outside in the corridor.
4
In enclosed kitchens with doors closed.
5
Greatly depends on ventilation and distance from source of
fumes.
8
Locations
Hall, Corridors, Escape Routes
Alarm Type
Optical Ionisation Heat
Bedrooms
Shower / Bathroom
Kitchens
Living Rooms
Fire Response
Slow Smouldering Fires
(polyurethane foam, ignited bedding etc.)
Nuisance Alarm Immunity
Cooking Fumes
Steam, Condensation &
Dust Build-up
Fast Flaming Fires
(chip pans, flaming wood/plastic, oil,
solvents etc.)
- Best
- Good
- Acceptable
- Not Suitable
Temperature >58
0
C
(only in areas with cooking fumes, steam,
very dirty/dusty)
Optical/Ionisation/Heat Alarm Selection
Locations & Performance
1 2
3
4
5
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