Abus HSRM20000 Manuel Utilisateur page 28

If you have more than one bedroom, each one should be fitted with a wireless smoke
detector.
To monitor corridors, you should also fit wireless smoke detectors there, because
stairwells are particularly susceptible to fires due to the chimney effect. Long
corridors might require several smoke detectors.
When fitting on the ceiling, make sure that the smoke detectors are at least 15 cm
from the side walls and 50 cm from the corners.
Warning
Avoid the following locations to prevent malfunctions of the wireless smoke
detector:
Places where expected temperature variations are greater than the ambient
operating temperature (+0 °C to +40 °C).
Places where draughts can keep smoke away from the detector, such as near
windows, doors or ventilation shafts.
Places where vapour, increased air humidity or exhaust fumes may trigger
false alarms, e.g. in kitchens, bathrooms or garages.
Places where dust or dirt could impair the function of the smoke detector.
The highest point in rooms with gable ceilings. The distance to the highest
point of the gable should be at least 30 cm.
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