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Appendix A Guidelines for Locating Smoke Detectors
Experience has shown that all hostile fires in family living
units generate smoke to a greater or lesser extent.
Experiments using typical fires in family living units indicate
that detectable quantities of smoke precede detectable
levels of heat in most cases. For these reasons, NFPA
standard 74 requires smoke detectors to be installed
outside of each sleeping area and on each additional story
of the family unit.
The following information is for general guidance only and
it is recommended that NFPA Standard 72 (
National Fire
Protection Association, One Batterymarch Park, Quincy
MA 02269
) be consulted and that the smoke detector
manufacturer’s literature be used for detailed installation
instructions.
It is recommended that additional smoke detectors beyond
those required be installed for increased protection. The
added areas include: basement, bedrooms, dining rooms,
furnace room, utility room and hallways not protected by
the required detectors.
FIG. 2: In the family living units with more than one
sleeping area, a smoke detector should be located to
protect each sleeping area.
Family Room Bedroom
Living
Room
Dining
Room
Kitchen
Bedroom Bedroom
Bedroom Bedroom
Bedroom
Living Room Kitchen
FIG. 1: A smoke detector should be located between
the sleeping area and the rest of the family unit.
Bedroom Bedroom
Basement
Living
Room Dining
Room
FIG. 3: A smoke detector should be located on each
story of the living unit.
FIG. 4: Smoke Detector mounting - “Dead” Air Space.
The smoke from a fire generally rises to the ceiling,
spreads out across the ceiling surface and begins to
bank down from the ceiling. The corner where the
ceiling and wall meet is an air space into which the
smoke may have difficulty penetrating. In most fires,
this “dead” air space measures about 4 in. (0.1m) along
the ceiling from the corner and about 4 in. (0.1m) down
the wall as shown in Figure 4. Detectors should not be
placed in the dead” air space.
NEVER
HERE
Acceptable
here
Top of detector
acceptable here
12"
(0.3m)
Max.
4"
(0.1m)
Max.
4"
(0.1m)
Ceiling
Wall
NOTE: Measurements shown are to
the closest edge of the detector.
The Smoke Detector is designed to use Eveready
Energizer Alkaline Batteries. Do not use other
brands of batteries with the Smoke Detector.
Using brands other than the Eveready Energizer
will void UL and ULC approvals, and may affect
the system’s operation.
Appendix A Guidelines for Locating Smoke Detectors