2. Installation
Recommended Locations
• Locate the first alarm in the immediate area of the bedrooms.
Try to monitor the exit path, as the bedrooms are usually
farthest from the exit. If more than one sleeping area exists,
locate additional alarms in each sleeping area (Image 1A).
• Locate additional alarms to monitor any stairway as stairways act
like chimneys for smoke and heat.
• Locate at least one alarm on every floor level (Image 1B).
• Locate an alarm in every Sleeping Room.
• Locate an alarm in every room where electrical appliances are
operated (i.e. portable heaters or humidifiers).
• 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 products rise to the ceiling and
spread horizontally. Mounting the smoke 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 10 cm (4”) from the side wall (Image 2A).
• 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 (Image 2A).
• Put smoke alarms at both ends of a bedroom hallway or large
room if the hallway or room is more than 9.1 m (30’) long.
• For mobile home installation, select locations carefully to avoid
thermal barriers that may form at the ceiling. For more details,
see Mobile Homes.
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