The FAMCO J Vent with Extension – Galvanized, also referred to as the JVX Roof Vent, is specifically designed for use on any roofing material. It has a low silhouette and is open on two sides to promote better air flow. The vent is designed to help eliminate moisture and heat buildup. The JVX roof vent features a 3″ bottom stem for a flex pipe connection. The FAMCO JVX is fabricated using 28 gauge galvanized steel and features a ⅛ inch screen. It comes in 3 inch, 4 inch, 6 inch, 7 inch, and 8 inch variants. The FAMCO JVX Roof Vent is manufactured by Famco in the USA and comes with a 1-year warranty against product defects and workmanship. If you have questions about this vent, refer to the FAQs above or contact us directly by phone or email.