HYYYYH Automatic - Model TV6 (Black)

Automatic Foundation Vents take the worry out of remembering to open and close vents as the weather changes. The vent has a bi-metal coil to open and close automatically without electricity. When the temperature reaches 70 degrees the vent is fully opened to provide air and fully closes at approximately 40 degrees to conserve energy and pipes. These vents are easily installed using screws or screw anchors and retaining clips. Both are included with the vents. No mortar is required for installation.