Straight pipe at detector entry
• A minimum of 20in. (500mm) of straight pipe
is required before the pipe enters the detector
– This allows airflow to become stable before
entering the flow sensor
– Short entry piping will NOT allow for
accurate flow monitoring
• Exhaust pipe does not have this requirement
• Breaking a pipe on multiple pipe system
– Will cause high flow on that pipe
– Will cause low flow on other pipes
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