They are really set up during the HVAC ductwork and are brought on to close if they sense smoke. Smoke dampers usually are made from aluminum and also have a motorized actuator that closes the damper. Smoke dampers kick in once they detect smoke during the air, closing off areas https://paxtonriwkz.bloggip.com/36660810/5-simple-statements-about-air-control-dampers-for-hot-climates-explained