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• 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” (10 cm) 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 mini-
mum of 4” (10 cm) and a maximum of 12” (30.5 cm) 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 feet (9.1 m) long.
• Install Smoke Alarms on sloped, peaked or cathedral ceilings at or within 3ft (0.9m) of the highest
point (measured horizontally). NFPA 72 states: “Smoke alarms in rooms with ceiling slopes greater
than 1 foot in 8 feet (.3m in 2.4 m) horizontally shall be located on the high side of the room.” NFPA
72 states: “A row of detectors shall be spaced and located within 3 ft (0.9m) of the peak of the ceil-
ing measured horizontally” (see FIGURE 3).
MOBILE HOME INSTALLATION
Modern mobile homes have been designed and built to be energy efficient. Install smoke alarms as
recommended above (refer to RECOMMENDED LOCATIONS and FIGURES 1 and 2).
In mobile homes that are not well insulated compared to present standards, extreme heat or cold can
be transferred from the outside to the inside through poorly insulated walls and roof. This may create a
thermal barrier which can prevent the smoke from reaching an alarm mounted on the ceiling. In such
units, install the smoke alarm on an inside wall with the top edge of the alarm at a minimum of 4” (10
cm) and a maximum of 12” (30.5 cm) below the ceiling (see FIGURE 1).
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 the alarm on an inside wall. For minimum protection, install at least
one alarm close to the bedrooms. For additional protection, see SINGLE FLOOR PLAN in FIGURE 2.
BEDROOM
BEDROOM KITCHEN
LIVING ROOM
BEDROOM
BEDROOM
BEDROOM
BASEMENT
KITCHEN
HALLBEDROOM
LIVING
ROOM
SINGLE FLOOR PLAN
MULTIPLE
FLOOR PLAN
(10 cm)
4"
MINIMUM
(10 cm)
4"
C
EILING
DEAD AIR
SPACE
SIDE
WALL
MINIMUM
(30.5 cm
)
12"
MAXIMU
M
BEST
HERE
NEVER
HERE
ACCEPTABLE
HERE
●SmokeAlarmsfor MinimumProtection
●●Smoke Alarms forAdditionalProtection
▲▲IonizationTypeSmoke Alarmswith
HUSH®Controlor PhotoelectricType
(0.9 m)
3'
(0.9 m)
3'
(102 mm)
4"
NOT
IN THIS
AREA
ANYWHERE
IN THIS
AREA
(0.9 m)
3'
(102 mm)
4"
ANYWHERE
IN THIS
AREA
NOT
IN THIS
AREA
FIGURE 1
FIGURE 2
FIGURE 3
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