WebAbout Air Flow Switch (AFS) The AFS is a general purpose airflow proving switch designed for HVAC and energy management applications. It may be used to sense positive, negative or differential air pressure. The plated housing contains a diaphragm, a calibration spring and a snap-acting SPDT (NC) switch. WebAir pressure switches measure the pressure at the intake and at the exhaust flue to make sure that combustion is occurring as it should, creating a positive draft. Depending on their location in the combustion path, air pressure switches may be designed to measure positive pressure, vacuum, or pressure differential across two areas.
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