Ampac FIRERAY 2000 - Flat Ceiling; Apex Ceiling - Shed Type

FIRERAY PRODUCT GUIDE
Page 8
Smoke layering, where smoke does not reach the ceiling level due to layers of static hot air, is
overcome by mounting the Optical Beam Smoke Detector / Reflector at the recommended height
below the ceiling of between 0.3 metres and 0.6 metres. This brings the infrared light beam below
the heat layer and into the smoke layer.
However, if there are objects below the ceiling that could obscure the beam path, the detector heads
/ Reflector positioning may need to be adjusted. (This can be determined by smoke tests)
The effects of stratification should also be considered when locating Optical Beam Smoke Detectors
(see 4.4.3 Stratification)
Note: There are several models for positioning Optical Beam Smoke Detectors. The most
common ones are described in the following pages.
4.3.1 Flat Ceiling
4.3.2 Apex Ceiling – Shed Type