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GUIDELINES FOR SMOKE

DETECTOR LOCATION

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 74 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. 1: A smoke detector should be located between

the sleeping area and the rest of the family unit.

FIG. 2: In the family living units with more than one

sleeping area, a smoke detector should be located to

protect each sleeping area.

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.

Bedroom

Dining

Room

Living

Room

Hall

Basement

Bedroom

Living

Room

Dining

Room

Kitchen

Bedroom

Family

Room

Acceptable here

Top of detector

acceptable here

Side wall

Note:

Measurements shown are to the

closest edge of the detector.

4 in.

(0.1m)

minimum

12 in.

(0.3m)

maximum

Never here

Ceiling

4 in.

(0.1m)

Bedroom

Bathroom

Kitchen

Living

Room

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