The FAMCO VDS Louvered Foundation Vent with Screen and Damper – Galvanized 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 28 gauge Galvanized steel. The FAMCO VDS Louvered Foundation Vent come in a range of sizes; 4×16 inch, 6×16 inch, 8×16 inch. This product includes a large mounting flange. Sold in 5 pieces per box. The FAMCO VDS 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 or the variations available, please refer to the FAQs above or feel free to contact us by phone or email.