Master Flow 16 in. x 8 in. Automatic Open/Close Foundation Vent in Black (Carton of 10)

The GAF Master Flow 16 in. x 8 in. Resin Automatic Foundation Vent in Black helps to reduce moisture and helps prevent decay in your foundation with a net free vent area of 57 sq. in. The vanes are factory set to automatically open fully at 70°F and close fully at 40°F. The UV resistant resin constructed unit easily slips into place and is held in place by tightening the 4 screws in the face of the unit.