411 Backdraft Dampers
The Model 411 is a non-flanged/drop-in frame horizontal mount automatic backdraft damper. It is designed to allow airflow in one direction and to prevent reverse airflow. The blades open with airflow and close by gravity when the fan shuts down. Models are available for exhaust or supply (intake) as well as for vertical mount applications. Ideal for use in roof curbs, duct work, or wall collars when using a fan or power roof ventilator. Do not use with any kitchen exhaust applications.
$40.00 USD
79 in stock
