Silent Call SD4-SS - Manual (Page 3)

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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 has been tested by ETL to comply with UL 217
(US). 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