Backdraft Dampers
A backdraft damper is able to allow contaminated air to flow out of an exhaust system, but prevents contaminated air from sweeping back in to the system.
Somtimes called a Butterfly Damper
A backdraft damper is able to allow contaminated air to flow out of an exhaust system, but prevents contaminated air from sweeping back in to the system.
Somtimes called a Butterfly Damper