15
Sloped ceilings
In rooms with inclined ceilings where
the slope is more than 20° from the
horizontal, pockets of heat can form
in the ceiling apex which can prevent
smoke from entering the smoke alarm.
Therefore, smoke alarms must be installed
at least 0.5 m and at most 1 m from the
ceiling apex in these rooms (see Figure 8).
✓
0.5 to 1 m
Gable
Fig. 8
Hallways
The distance from the front face of the
hallway (hallway = max. 3 m wide) to the
first alarm must not be more than 7.5 m.
An alarm should be installed in corner areas
(cornice joints), junctions and crossings in
hallways. The maximum distance between
two smoke alarms in hallways should be
15 m (see Figure 7).
Max. 15 m
Max.
7.5 m
Fig. 7
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