Bosch F.01U.323.385 Instruction Manual page 23

Align the straight edge of the mounting bracket parallel to the ceiling
edge of the desired room so the Smoke Alarm is parallel to the edge of
the room.
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In order to prevent injury, the mounting instructions in this instruction
manual must be followed and the general safety regulations observed.
When choosing a mounting location and when drilling, pay attention
to potential electrical cables and/or supply lines that could be behind
the wall.
The kit includes two 3.5 x 30 mm countersunk cross-head screws and
two 5 mm universal wall plugs, which are suitable for fitting to concrete
ceilings.
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