411 Backdraft Dampers Size:15"x15" This notification device can be

This notification device can be flush or surface mounted on a standard 4” x 4” electrical box

LADBS Approved

Broan® High-Capacity

256 CFM at 0

411 Backdraft Dampers Size:15"x15" This notification device can beThe 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