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Smoke, heat and combustion particles rise to the ceiling and spread
horizontally. Mounting the alarm on the ceiling in the center of the
room places it closest to all points in the room. Ceiling mounting is
preferred in ordinary residential construction. When mounting an
alarm on the ceiling, locate it at a minimum of 4" (10.2 cm) from
the side wall (see Image 2A).
If installing the alarm on the wall, use an inside wall with the top
edge of the alarm at a minimum of 4" (10.2 cm) and a maximum of
12" (30.5 cm) below the ceiling (see Image 2A).
Sloped Ceiling Installation
The following information is from the National Fire Protection
Association and is listed in Standard 72. Install smoke alarms on
sloped, peaked or cathedral ceilings at, or within 0.9 m (3’) of
the highest point (measured horizontally) (see Diagram A). NFPA
72 states “Smoke alarms in rooms with ceiling slopes greater than
0.3 m to 2.4 m (1' to 8') horizontally shall be located on the high
side of the room.” NFPA 72 also states “A row of alarms shall be
spaced and located within 0.9 m (3') of the peak of the ceiling
measured horizontally” (see Image 2B and 2C).
Mobile Homes
Modern mobile homes have been designed and built to be energy
efficient. In older mobile homes that are not well insulated, extreme
heat or cold can be transferred from the outside to the inside
through poorly insulated walls and roofs. This may cause a thermal
barrier, which can prevent smoke from reaching an alarm mounted
on the ceiling.
In such mobile homes install your smoke/CO alarm on an inside wall
with the top edge of the alarm at a minimum of 10 cm (4") and a
maximum of 30.5 cm (12") below the ceiling (see Diagram 2D). If
you are not sure about the insulation in your mobile home, or if you
notice that the outer walls and ceiling are either hot or cold, install
your alarm on an inside wall ONLY!
THIS EQUIPMENT SHOULD BE INSTALLED IN ACCORDANCE WITH
THE NATIONAL FIRE PROTECTION ASSOCIATION’S STANDARD
72
(National Fire Protection Association, Batterymarch Park, Quincy,
MA 02269).