•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).
4"
(10 cm)
CEILINGMINIMUM
DEAD AIR
SPACE
4"
(10 cm)
MINIMUM
BEST NEVER
HERE HERE
12"
(30.5 cm)
MAXIMUM
ACCEPTABLE 
HERE
SIDE
WALL
FIGURE 1
| NOT |
| IN THIS |
| AREA |
4" | ANYWHERE |
(102 mm) | IN THIS |
| AREA |
3' | 3' |
(0.9 m) | (0.9 m) |
| NOT |
| IN THIS |
SINGLE FLOOR PLAN
BEDROOM KITCHEN | BEDROOM BEDROOM |
LIVING ROOM | BEDROOM |
● Smoke Alarms for Minimum Protection
●Smoke Alarms for Additional Protection
▲ Ionization Type Smoke Alarms with HUSH® Control or Photoelectric Type
MULTIPLE
FLOOR PLAN
BEDROOM HALL BEDROOM
LIVING | KITCHEN |
ROOM |
|
BASEMENT |
|
ANYWHERE | AREA |
IN THIS |
|
AREA | 4" |
(102 mm)
3'
(0.9 m)
FIGURE 2
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.