Monitoring With Forced Airflow; Detection At Intake And Exhaust Openings; Detection In The Bypass - Bosch FAS-420-TM Operation Manual

FAS-420-TM Aspirating Smoke Detector
5.4

Monitoring with Forced Airflow

5.4.1

Detection at Intake and Exhaust Openings

CAUTION!
If the smoke aspiration occurs in a forced airflow (fan, air-conditioning units), direct the air
sampling openings depending on the exhaust speed in the airflow (see Figure 5.4).
Figure 5.4 Positioning the air sampling opening depending on air
speed
5.4.2

Detection in the Bypass

For details on connecting the air return, please see Section 5.6 Air-return pipe, page 72.
Figure 5.5 Positioning the air-return pipe – example with an air-
conditioning duct (bypass)
For FAS-420-TM planning in these applications, see Section 3.9 Planning for forced airflow,
page 52.
Bosch Sicherheitssysteme GmbH
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Operation Guide
Installation of the Pipe System | en
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Aspiration pipe with air sampling
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Exhaust speed < 0.5 m/s
Exhaust speed > 0.5 m/s
Air-conditioning duct
Duct adapter
Aspiration
Air-return Pipe
Width of air-conditioning duct
F.01U.088.878 | 4.1 | 2010.11
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