411 Backdraft Dampers Size:15"x15" LADBS Approved

LADBS Approved

Internal Buzzer

but includes upgraded performance and features such as a more efficient motor

Field-replaceable Oxygen (O2) sensor for OX-6 and OX-12

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

411 Backdraft Dampers Size:15"x15" LADBS ApprovedThe 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