If the thermostat senses a modify in temperature, it sends a sign on the zone damper, which opens or closes to regulate the air circulation to that zone. Backdraft dampers are possibly gravity or motorized. Gravity backdraft dampers utilize the pressure of gravity to close the damper when there isn't https://air-control-dampers-for-h35667.blogdun.com/37361817/air-control-dampers-for-engine-sheds-options