Honeywell MS4109F1210 2-Position Fire/Smoke Damper Actuator W/80 lb-in 2 Switches 120V

The Honeywell MS4109F1210 120Vfiresmoke80 2Possr 2Sw Act is a fire and smoke damper actuator, not an alarm itself. It is an essential part of HVAC systems, especially the ones that have fire dampers. When a fire or smoke signal is received, these dampers instantly close, stopping the spread of flames and fumes throughout the ductwork.The MS4109F1210 has two positions: open and closed, and it is powered by a 120-volt AC supply. Because it has spring-return, if power is lost, it will automatically return to the open position. With two internal switches that may be used to trigger the fire alarm system or other building systems, this fail-safe design makes sure the damper opens in the event of a power outage, allowing flames and heat to exit the structure.