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Ceiling mounting is preferred in ordinary residential construction.
• For mobile home installation, select locations carefully to avoid
thermal barriers that may form at the ceiling. For more details,
see MOBILE HOME INSTALLATION below.
• When mounting an alarm on the ceiling, locate it at a minimum
of 4" (10cm) from the side wall (see figure 1).
• When mounting the alarm on the wall, use an inside wall with
the top edge of the alarm at a minimum of 4" (10cm) and a
maximum of 12" (30.5cm) below the ceiling (see figure 1).
• Put smoke alarms at both ends of a bedroom hallway or large
room if the hallway or room is more than 30 ft (9.1m) long.
• Install Smoke Alarms on sloped, peaked or cathedral ceilings
at or within 3 ft (0.9m) of the highest point (measured hori-
zontally). NFPA 72 states: "Smoke alarms in rooms with ceiling
slopes greater than 1 ft in 8 ft (.3m in 2.4m) horizontally shall
be located on the high side of the room." NFPA 72 states: "A
row of alarms shall be spaced and located within 3 ft (0.9m) of
the peak of the ceiling measured horizontally" (see figure 3).
Required
Required
Required
FIGURe 1
FIGURe 2
FIGURe 3
Required
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