The Honeywell MS8105A1130 44 DCA On/Off with Auxiliary Switch and Relay is a critical component in HVAC systems, ensuring accurate control of airflow and temperature. It responds to thermostat signals by opening and closing dampers to control air flow through ducts. Designed specifically for damper use, it maximizes indoor comfort and operational efficiency. #Honeywell #MS8105A1130... https://www.partshnc.com/44dca-onoffwauxsw-sr-45sec-2