Heiman SMOKI HM-626PHS, User Manual

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13.2 Smoke alarms cannot work without power.
Battery operated units cannot work if the batteries are
missing, disconnected or dead, if the wrong type of batteries
are used, or if the batteries are not installed correctly. AC
units cannot work if the AC power is cut off for any reason
(open fuse or circuit breaker , failure along a power line or at
a power station, electrical fire that burns the electrical wires,
etc.). If you are concerned about the limitations of battery or
AC power, install both types of units.
13.3 Smoke alarms cannot detect fires if the smoke does
not reach the alarms.
Smoke from fires in chimneys or walls, on roofs, or on the
other side of closed doors may not reach the sensing
chamber and set off the Alarm. That is why one unit should
b e i n s t a l l e d i n s i d e e a c h b e d r o o m o r s l e e p i n g
area—especially if bedroom or sleeping area doors are
closed at night—and in the hallway between them.