The FAMCO VDSA Louvered Foundation Vent with Screen and Damper – Aluminum promotes free air movement in a crawl space or attic. Made with a hemmed edge for strength and corrosion proof hinges on the damper. Includes a 1/8 inch screen. (A 1/4 inch screen is available.) Quality constructed in .020 gauge Aluminum. The FAMCO VDSA Louvered Foundation Vent comes 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 VDSA Louvered Foundation Vent 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, please refer to the FAQs above or feel free to contact us by phone or email.