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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 INSTALLA-
TION section.
• When mounting an alarm on the ceiling, locate it at a minimum of 10 cm (4”) from
the side wall (Figure 6-A).
• When mounting the alarm on the wall, use 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 (Figure 6-A).
• Put smoke alarms at both ends of a bedroom hallway or large room if the hall-
way or room is more than 9.1m (30 ft) long.
• Install Smoke Alarms on sloped, peaked or cathedral ceilings at least 0.9m (3ft)
from the highest point (measured horizontally). See Figure 6-C.
This equipment should be installed in accordance with: CAN/ULC-S553,
Standard for Installation of Smoke Alarms.
Mobile Home Installation
Modern mobile homes have been designed and built to be energy efficient. Install
smoke alarms as recommended above. In older 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 cre-
ate 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 10 cm (4”) and a maximum of 30.5 cm (12”) below
the ceiling.
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 compared to the room air temperature,
install the alarm on an inside wall. CAN/ULC-S553 and NFPA 72 require smoke
alarms be installed in or near each sleeping area.
WARNING: TEST YOUR ALARM OPERATION AFTER MOBILE HOME
HAS BEEN IN STORAGE OR UNOCCUPIED, AND AT LEAST ONCE A WEEK
DURING USE.
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