The FAMCO JVO38 roof vent is one of the best built and most reliable vent caps on the market. It features 38 square inches net free area, insect screen, low silhouette and a removable hood for access to the attic area when needed. It is open on all four sides for better air flow and unrestricted venting to help eliminate moisture and heat buildup. This vent works best when used with soffit or gable end venting. Quality constructed in 28 gauge Galvanized, 16 ounce Copper, and 28 gauge pre-painted Steel (black, brown, gray, or white).