They're mounted during the HVAC ductwork and they are brought on to close once they feeling smoke. Smoke dampers are frequently fabricated from aluminum and possess a motorized actuator that closes the damper. Smoke dampers kick in whenever they detect smoke within the air, closing off aspects of the ventilation https://air-control-dampers-for-h46788.buyoutblog.com/36413228/the-best-side-of-air-control-dampers-for-engine-sheds