Kidde KN-COSM-B-RF User Manual page 26

bedroom. Verify the alarm can be heard in all sleeping areas.
Locate an alarm in every room where someone sleeps with
the door closed. The closed door may prevent an alarm not
located in that room from waking the sleeper. 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 Diagrams B and C).
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 Diagram C).
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 3 ft. (0.9 m) of
the highest point (measured horizontally) (see Diagram A). NFPA
72 states "Smoke alarms in rooms with ceiling slopes greater
than 1 ft. to 8 ft. (0.3 m to 2.4 m) 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 3 ft. (0.9 m) of the peak of the
ceiling measured horizontally" (see Diagram B).
Mobile Homes
Modern mobile homes have been designed and built to be
energy efficient. Install smoke/CO alarms as recommended
above (refer to Where to Mount the Alarm section and Diagram
C). 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
26 Installation Guide