NorWesco 7-1/4 In. x 18-1/2 In. Adjustable Foundation Vent with Damper

Adjustable foundation vent with 1/4 In. galvanized screen protects against moisture and allows for the natural flow of fresh air under structures. Circulates fresh air and removes musty, moist air. Nail holes break away when forms are removed. 100 Sq. In. free area.