Air Vent 16 in. x 8 in. Automatic Foundation Vent in Gray (Carton of 10)

The vent has a bi-metal coil to open and close automatically without electricity. When the temperature reaches 70°F the vent is fully opened to provide fresh intake air and fully closes at approximately 40°F to conserve energy and protect pipes. These vents are easily installed using screws, or screw anchors or with retaining clips. Both are included with the vents. No mortar is required for installation.