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Vertical shafts like lifts and stairways should have a device mounted within
1.5m of any opening.
Enclosed stairways should have a detector on each main landing.
The sensing element of a heat detection device (thermistor) should not be less
than 25mm below ceiling, and not greater than 150mm below ceiling.
The sensing element of a smoke detection device (photoelectric smoke
chamber) should not be less than 25mm below ceiling, and not greater than
600mm below ceiling.
Smoke Detectors
Optical Chamber
25mm
600mm
Heat Detectors
Thermistor
25mm
150mm
(Sub landing)
Lift ShaftLift Shaft
1.5m
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