Bosch FAD-420-HS-EN Duct Smoke Detector - Manual (Page 57)

Duct Smoke Detector Installation/configuration notes | en 57
Bosch Sicherheitssysteme GmbH Installation guide F.01U.033.733 | 5.0 | 2011.11
If in doubt, use an airflow measuring device to measure the air
speed in the duct.
3.2 Installation position
Avoid selecting an installation position near ducts with dead-air
space or areas with turbulence.
Turbulence mainly occurs near connecting flanges, branches,
tight bends, and long, straight ducts.
Place the FAD-420-HS-EN at a distance of at least three times
the width of the ventilation duct [b
≥ 3 x d] away from these
critical areas (see Figure 3.1).
3.3 Housing position
The FAD-420-HS-EN must only be mounted in a vertical or
horizontal position (see Figure 3.2).
Figure 3.2 Position of housing on the ventilation duct
1 2 3
No. Description
e Airflow direction