Lennox 80W57 SPST Pressure Switch 0.65" WC

The Lennox 80W57 Pressure Switch is a mechanical control element that regulates the pressure of air or gas in the HVAC systems and turns on or off the circuits when the pressure reaches certain predetermined values. It is hard-wired and a single-pole, single-throw switch, and its actuation point is 0.65-inch water column to ensure that there is enough airflow or combustion pressure to allow the system to be operated. It is used in furnaces, air handlers, or ventilation equipment to make a sufficient draft or to ensure blower action is done.