The FAMCO LRV50 Louvered Roof Vent with Slant Back. A great heavy duty vent for use on pitched roofs. This Slant Back Roof Vent is one of the best built and most reliable on the market. It features a 50 square inch opening, louvers on three sides, slant back and low silhouette. The vent works best when used with a soffit or gable end venting. Fits all pitched roofs. Sealed weather-proof collar. High collar for increased weather protection. Quality constructed in 28 gauge Galvanized steel. Pre-painted steel color options are Black, Brown, Gray, and White. The FAMCO LRV50 Louvered Roof Vent with Slant Back has a flange that measures 15-7/8 x 20-1/2 inches and will receive a 9 inch diameter pipe. The FAMCO LRV50 Louvered Roof Vent with Slant Back 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.