The NFPA, 1993 Edition, Appendix A further states:
“The required number of smoke detectors may not provide reliable early warning protection for those areas separated by a door from the areas protected by the required smoke detectors.
BEDROOM HALL BEDROOM
LIVING | DINING |
ROOM | ROOM |
/ 
BASEMENT
Typical Efficiency Home (Apartment)
•Install a combination alarm on the ceiling or wall closest to the sleeping area.
DINING
ROOMKITCHEN BEDROOM
TV ROOM
LIVING ROOM
BEDROOM
BEDROOM
Typical Mobile Home
NOTE: For mobile homes built before 1978, install alarms on an inside wall between 4 and 12 inches from the ceiling. (Older mobile homes have little or no insulation in the ceiling.) This is
For this reason, it is recommended that the house holder consider the use of additional smoke detectors for those areas for increased protection. The additional areas include: base- ment, bedrooms, dining room, furnace room, utility room, and hallways not protected by the required smoke detectors.”
Also, as required by the
California State Fire Marshal:
“Early warning fire detection is best achieved by the installation of fire detection equipment in all rooms and areas of the household as follows: a smoke detector installed in each separate sleep- ing area (in the vicinity, but outside the bed- rooms), and heat or smoke detectors in the liv- ing rooms, dining rooms, bedrooms, kitchens, hallways, attics, furnace rooms, closets, utility and storage rooms, basements and attached garages.”
For best protection, install a smoke alarm in EVERY room. In addition, we recommend that all smoke alarms be interconnected.
especially important if the ceiling is unusually hot or cold.
•Install a combination alarm inside each bedroom and in the hallway outside each separate sleeping area.
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