Chapter 2: Installation and configuration
18 LaserSense Nano Aspirating Smoke Detector Installers Handbook
Pipework
Figure 8: Pipework
(1) Sampling pipe
3/4 in. pipe or 25 mm pipe with a 3/4 in. sleeve adapter.
The maximum sampling pipe length is 50 m.
Fit an end cap with an approximately sized hole to optimize airflow through the pipe.
(2) Exhaust pipe
3/4 in. pipe or 25 mm pipe with a 3/4 in. sleeve adapter.
If the protected area is at a lower atmospheric pressure than the location in which the
detector is installed (e.g. a closed air conditioned room), fit a return pipe run from the detector
exhaust to the protected area in order to equalize the pressure. This will improve detector
response.
Even if the protected area and detector are at the same atmospheric pressure, it is a good
practice to fit a pipe stub with a bend to the exhaust to prevent debris from falling into the
detector.
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