// CODE SNIPPET
516.3.4 Airflow Switch or Transducer
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An airflow
switch or transducer shall be provided after the last filter
component to ensure that a minimum airflow is maintained.
The airflow switch or transducer shall open the
interlock circuit where the airflow falls 25 percent below
the system's normal operating flow or 10 percent below
its listed minimum rating, whichever is lower. The
airflow switch or transducer shall be a manual reset
device or circuit. [NFPA 96:13.3.5.1 - 13.3.5.3]
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