Back Draft Damper
The back draft damper is essential to prevent air being blown back through the external vent into house. The exhaust air can still be pushed to the outside and then the damper will shut when a draft comes back the other way.
The back draft damper is essential to prevent air being blown back through the external vent into house. The exhaust air can still be pushed to the outside and then the damper will shut when a draft comes back the other way.
