More vent area than any other vent cover. More fresh air rain or shine. Twice as much vent area as our original vent cover. Side louvers provide unsurpassed cross ventilation. Hinged hardware included for easy opening and cleaning - no tools required. Solid one-piece, sleek aerodynamic design. More than 2 million RV owners have purchased the original MaxxAir vent cover, making it the industry's top seller. Now the new MaxxAir II with double the vent area and with hinged hardware included, is an even better value. Stainless steel snap lock pins remove for easy access. Aerodynamic shape maximizes vent area and mounts to the same holes as the MaxxAir standard vent cover. Hinged brackets provide full access for cleaning and inspection of roof vent seal.