Product Description
Damper opens automatically when the furnace blower comes on and closes when the furnace blower turnoff.
When the furnace is not in use, the damper keeps air from the ductwork from coming inside the furnace.
Required with self contained air conditioners.
A 12" x 12" minimum opening in the duct is needed to use a damper. Total size is 16.25" x 15".
