The AERCO Boiler and Water Heater 60011-4 Blower Proof Switch Assembly is a safety control designed to verify proper blower operation in compatible AERCO boilers and water heaters. It monitors air pressure created by the blower and signals the control system when adequate airflow is established, helping ensure safe burner operation. This assembly supports reliable combustion and helps... https://www.partshnc.com/aerco-boiler-and-water-heater-60011-4-blower-proof-switch-assembly