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pitched roofs. Here, the smoke detector must not
be installed at the apex of the roof. If it is to be
installed on the roof, it must be mounted around 1
m below the room’s highest point or, even better,
on a (roof) beam.
This is because a build up of air near to walls,
and particularly in the corners of a room and at
the apex of a pointed roof, stops the rising smoke
from reaching the walls or the corners of the room.
For this reason, a smoke detector must never be
installed within approximately 50 cm of the corners
of a room. A smoke detector installed in this area
would be ineffective in an emergency situation and
would raise the alarm too late.
To check that the installation location is
acceptable in terms of the smoke detector’s
audible alarm, trigger a test alarm (see Section 9,
“Function check and operation”) whilst someone is
sleeping in the bedroom.
The smoke detector really has to wake you up; it’s
no good if you can only just hear it when you’re
already awake.
Finally, when at its installation location each
smoke detector must be thoroughly tested to
ensure that it can access the central control unit
wirelessly in all circumstances.
Summary of Contents for HM-Sec-SD
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