The FAMCO VDA Louvered Foundation Vent with Damper – Aluminum promotes free air movement in a crawl space or attic installation. Made with a hemmed edge for strength as well as corrosion proof hinges on the damper. Quality constructed in .020 gauge Aluminum. The FAMCO VDA Louvered Foundation Vent with Damper is available in sizes 4×16 inch, 6×16 inch, 8×16 inch and includes a large mounting flange. Sold in 5 pieces per box. The FAMCO VDA Louvered Foundation Vent with Damper is manufactured by Famco in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this product or the variations available, please refer to the FAQs above or feel free to contact us by phone or email.