411 Backdraft Dampers Size:15"x15" Models are available for exhaust

Models are available for exhaust or supply (intake) as well as for vertical mount applications

Internal Buzzer

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

controller and as an analog transducer for use with Macurco control panels and other systems – ETL Listed

120V 1/2HP 5

411 Backdraft Dampers Size:15"x15" Models are available for exhaustThe 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