Are More Smoke Alarms Desirable? The required number of
smoke alarms might not provide reliable early warning protection for
those areas separated by a door from the areas protected by the
required smoke alarms. For this reason, the use of additional smoke
alarms for those areas for increased protection is recommended.
The additional areas include the basement, bedrooms, dining room,
furnace room, utility room, and hallways not protected by the
required smoke alarms. The installation of smoke alarms in
kitchens, attics (finished or unfinished), or garages is not normally
recommended, because these locations occasionally experience
conditions that can result in improper operation.
IMPORTANT CONSIDERATION
NFPA recommends replacing your smoke alarm(s) every ten
(10) years; why:
Dust, dirt, and other environmental contaminants can affect your
smoke alarm over a prolonged period.
Fast changing industry consensus standards and codes on all
smoke alarms make it advisable to periodically upgrade your
devices to maximize life safety.
Assurance that your smoke alarm needs are kept abreast with
the constantly improving electronic technology.
Smoke alarms are recognized as one of the lowest cost ways to
protect dwelling inhabitants against the danger of fire(s). It
makes good common sense to periodically replace and update
your smoke alarm that contributes so much to life safety.
MOUNTING LOCATION
This smoke alarm can be mounted on a ceiling or wall with equal
efficiency in either location.
Ceiling location - smoke alarm should be mounted as close as
possible to the center of a hallway or room. If this is not
possible, the edge of the unit should be at least 4 inches from
any wall.
Wall location - locate the top of the smoke alarm at least 4 inches
and not more than 12 inches from the ceiling.
Pg. 4-3
Figure 5: RECOMMENDED SMOKE ALARM MOUNTING
LOCATIONS
Figure 6: RECOMMENDED SMOKE ALARM LOCATION IN
ROOMS WITH SLOPED, GABLED, OR PEAKED CEILINGS.
The placement of the smoke alarm is critical if maximum speed
of fire detection is desired. Thus, a logical location for a smoke
alarm is the center of the ceiling. At this location, the device is
closest to all areas of the room.
WHERE SMOKE ALARMS SHOULD BE
PUT IN MOBILE HOMES
In mobile homes built after about 1978 that were designed and
insulated to be energy-efficient, smoke alarms should be installed as
described in the section above.
Figure 3: IN DWELLING UNITS WITH MORE THAN ONE
SLEEPING AREA, A SMOKE ALARM SHOULD BE PROVIDED TO
PROTECT EACH SLEEPING AREA IN ADDITION TO SMOKE
ALARMS REQUIRED IN BEDROOMS.
Figure 2: A SMOKE ALARM SHOULD BE LOCATED BETWEEN
THE SLEEPING AREA AND THE REST OF THE DWELLING UNIT
AS WELL AS IN EACH BEDROOM.
Figure 4: A SMOKE ALARM SHOULD BE LOCATED ON EACH
LEVEL IN ADDITION TO EACH BEDROOM.
Figure 1: A SMOKE ALARM SHOULD BE LOCATED ON EVERY
LEVEL OF DWELLING UNIT, INCLUDING BASEMENT, WITHIN
EACH SLEEPING ROOM AND OUTSIDE SLEEPING AREAS.
Figure 1
Where to Locate the Required Smoke Alarms. The major threat
from fire in a dwelling unit occurs at night when everyone is asleep.
Persons in sleeping areas can be threatened by fires in the
remainder of the unit; therefore, smoke alarms are best located in
each bedroom and between the bedroom areas and the rest of the
unit as shown in Figure 2.
Figure 2
In dwelling units with more than one bedroom area or with
bedrooms on more than one floor, more than one smoke alarm is
required, as shown in Figure 3.
Figure 3
In addition to smoke alarms outside of the sleeping areas and in
each bedroom, NFPA 72 requires the installation of a smoke alarm
on each additional level of the dwelling unit, including the basement.
These installations are shown in Figure 4. The living area smoke
alarm should be installed in the living room or near the stairway to
the upper lever, or in both locations. The basement smoke alarm
should be installed in close proximity to the stairway leading to the
floor above. Where installed on an open-joisted ceiling, the smoke
alarm should be placed on the bottom of the joists. The smoke
alarm should be positioned relative to the stairway so as to intercept
smoke coming from a fire in the basement before the smoke enters
the stairway.
Figure 4
Figures 1, 2, 3, & 4 are reprinted with permission from NFPA 72, National Fire Alarm
Code®, Copyright ©2002, National Fire Protection Association, Quincy, MA 02169. This
reprinted material is not the complete and official position of the National Fire Protection
Association on the referenced subject which is represented only by the standard in its
entirety. National Fire Alarm Code® and NFPA 72® are registered trademarks of the
National Fire Protection Association, Inc., Quincy, MA 02169.
Figure 5
Figure 6
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