Abus FU8340 Mode D'emploi page 22

Place the smoke detector directly on the ceiling in the centre of the room.
Smoke detectors should not be more than 8 metres apart.
When fitting on the ceiling, make sure that the smoke detector is at least 15 cm
from the side walls and 50 cm from the corners.
When fixed to a wall, the smoke detector must be at least 15 cm from the
ceiling. In attics with roof ridges, the detector must be mounted 90 cm from the
centre of the wall.
To guarantee problem-free operation, the detector must NOT be painted and
must NOT be fixed in the following locations:
1. Places where expected temperature variations are greater than the ambient
operating temperature (0 °C to +40 °C).
2. Places where draughts can keep smoke away from the detector, such as
near windows, doors or ventilation shafts.
3. Places with steam, high air humidity or exhaust gases, e.g. kitchens,
bathrooms or garages.
4. Places where thick dust or smoke could impair the function of the smoke
detector.
5. At the highest point of a gable roof. The distance to the rooftop should be at
least 30 cm.
6. Above a heater or near the floor.
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