FAS-420-TM Aspirating Smoke Detector Planning | en 53
Bosch Sicherheitssysteme GmbH Operation Guide F.01U.088.878 | 4.1 | 2010.11
Aspiration
To achieve optimal detection results, the pipe system should be organized into the areas v
1
to v
3
Installation location of the pipe system
The exhaust duct should be selected as the installation location of the pipe system, as far as
possible away from the sound dampers, air baffles and bends. The distance from obstacles of
this kind should be at least three times the smallest duct diameter.
If it is absolutely essential to install the pipe system directly behind air baffles, sound
dampers or bends; the main speed ranges must be monitored (see Figure 3.16/Figure 3.17).
When installing a pipe system in air-conditioning ducts, the following must be observed:
– Since the FAS-420-TM and the pipe system are located in different pressure ranges, an
air return pipe (see Figure 3.18) must be provided.
– The pipe entries into the duct must be airtight.
– The portion of the pipe system that is outside the duct must be sealed airtight.
Figure 3.16 Direction change of the duct without air baffles
1 Main speed range
2
Exceptional arrangement of the
pipe system (if distance of
3xd
min
cannot be observed)
3 Typical pipe system
arrangement
d
min
Smallest duct diameter
Figure 3.17 Sound dampers in a duct
1 Smoke aspiration pipe
2 Air-conditioning duct
3 Main speed range
4Sound dampers
5Bore
3 x d
min
1
23
1
2 34 5
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