The Reznor 196362 Pressure Switch is a safety control component designed for compatible Reznor gas furnaces, unit heaters, and other gas-fired HVAC equipment. It monitors the system's air pressure to verify proper venting and inducer fan operation before allowing the burner to ignite. If the required pressure is not detected, it interrupts the ignition sequence to help prevent unsafe ... https://www.partshnc.com/pressure-switch-055wc