High Profile roof vent 13.38" L x 7.75"w x 2.25" H with cover closed Cutout template provided for install Easy open handle from bottom to allow lid opening, bi-directional Include - 1 roof gasket, designed for exterior mounting Two pieces on underside are of plastic that support pivot action, viewable in bottom image Watertight construction with lid in closed position Common roof vent used on horse trailers as well as any other enclosed tow vehicle requiring air flow 1 -Aluminum Pop-up vent 13.375 L x 7.75" w x 2.40" h ( flange to cover closed) overall size. Bi-directional, forward or reverse top opening. Mounting flange has a perimeter of holes for fastening, (12) 3/16" diameter. Top lid securely clamps down to prevent water entry, gasket-ed lid. Cutout opening 5 5/8" x 11 1/4", inside corners require a 2.25" radius. Designed to place on a flat roof. Includes (1) 1/8" thick neoprene gasket. There are two plastic support ends that are part of the mechanism that allows lid to pivot.