The GAF Master Flow Slider style foundation vent allows air circulation to reduce moisture and helps prevent decay in your foundation crawl space. It has a net free vent area of 40 sq. in. Item requires mortar to install. The product is polypropylene, includes a screen and fits a standard 16 in. x 8 in. foundation vent opening. The slider adjusts manually to open and close.
Plastic foundation vent slider with lintel
Easy to operate slide action - adjusts manually
40-sq in NFA
Polypropylene construction
Easy one-piece installation
For brick, block, or frame construction
See warranty guide for detailed warranty information