The Belimo FSLF24-FC Fire/Smoke Actuator is a 24V spring-return actuator designed to operate fire and smoke dampers in HVAC ventilation and air-conditioning systems. It uses an on/off control mechanism to open dampers when power is supplied and automatically returns them to their fail-safe position when power is interrupted. Featuring 30 in-lb torque and a 3/8-inch flexible conduit co... https://www.partshnc.com/fslf24-fc-belimo-firesmoke-24vsr-onoff-38flex