Silent Call 1008-4 - Manual (Page 3)

3
Smoke detectors may not sense fires that start where smoke cannot reach
the detectors such as in chimneys, in walls, on roofs, or on the other side of
closed doors. If bedroom doors are usually closed at night, detectors should
be placed in each bedroom as well as in the common hallway between
them.
Smoke detectors also may not sense a fire on another level of the residence
or building. For example, a second-floor detector may not sense a first-floor
or basement fire. Therefore, detectors should be placed on every level of a
residence or building.
The horn in your detector meets or exceeds current audibility requirements
of Underwriters Laboratories. However, if the detector is located outside
a bedroom, it may not wake a sound sleeper, especially if the bedroom
door is closed or only partly open. If the detector is located on a different
level of the residence than the bedrooms, it is even less likely to wake up
people sleeping in the bedrooms. In such cases, the National Fire Protection
Association recommends that the detectors be interconnected so that all
detectors sound an alarm when any one of the detectors sense smoke.
All types of smoke detectors have limitations. No type of smoke detector