They are put in in the HVAC ductwork and are activated to close when they feeling smoke. Smoke dampers tend to be manufactured from aluminum and possess a motorized actuator that closes the damper. Backdraft dampers are both gravity or motorized. Gravity backdraft dampers use the force of gravity to https://air-control-dampers-for-e02234.kylieblog.com/37347129/facts-about-air-control-dampers-for-hot-climates-revealed