Backdraft damper, vertical mount, Model BD-330, 10 In Sq, No Flange, Performance up to 1,500 ft/min

The BD-330 is a vertical mount backdraft damper designed to allow horizontal airflow and prevent reverse airflow. The dampers are opened by air pressure differential and closed by gravity. The damper features a flangeless, galvanized steel frame with aluminum blades.

• Complies with the International Energy Conservation Code (IECC) and ASHRAE 90.1 leakage requirements for non-motorized dampers
• AMCA certified for Air Leakage and Air Performance
• Width and height furnished approximately 0.125 in. under size