Backdraft damper, vertical mount, Model WD-330, 20 In Sq, No Flange, Performance up to 2,500 ft/min
Greenheck Product # WD330-20X20
The WD-330 series dampers are designed to prevent reverse airflow in horizontal exhaust applications. The WD-330 features a pressure sensitive blade design that opens and remains open under low velocity conditions. The dampers are opened by air pressure differential and closed by gravity. Galvanized steel, flangeless frame.
- Width and height furnished approximately 0.125 in. under size