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Aspirating Smoke Detector
1
3
F
A
Air-return pipe
Air-return pipe
The air-return pipe must be positioned at a distance of at least 2 m from the aspiration. The
open end of the return is sloped at a 45° angle.
Offset arrangement of the air return
If the distance of 2 m cannot be adhered to, the pipes must be arranged offset. This way, a
pressure fall between intake and exhaust can be achieved since the pipes are located in
different speed ranges.
The distance of the air sampling openings to one another and to the duct wall is represented
in the following table.
Bore distances
Bosch Sicherheitssysteme GmbH
2
FAS / FCS
5
4
3
2
A
FAS / FCS
3
A
2
FAS / FCS
Distance of the air sampling openings
to the wall
Distance of the air sampling openings
to one another
2
1/2 b
5
1
v
4
v
3
v
2
B
v
1
1
v
v
v
v
B
≥ 200 mm
2
Operation Guide
F
Front view
A
Plan view
1
Air-conditioning duct
2
Duct adapter
b
3
Airflow
4
Aspiration
5
Air-return pipe
b
Width of air-conditioning
duct
v
Flow speed
- v
1
4
1
Air-conditioning duct
2
Duct adapter
4
3
3
Airflow
2
A
Aspiration in area v1
1
B
Return in area v3
v1 to
Flow speed
v4
Duct cross-
Duct cross-
section ≤ 0.5 m²
section > 0.5 m²
100 to 200 mm
200 to 300 mm
100 mm
150 mm
2018.04 | 2.0 | F.01U.130.926
Planning | en
71
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