Aluminum Black Popup Roof Vent - bi directional action , egro handle to release top lid See attached drawing for dimensions, template & Install instructions included Lid gasketed to seal water penetration upon closed Roof top mounted is suggested, side mounting also acceptable Two pieces on underside are of plastic that support pivot action 1- roof gasket & trim ring accomodates insulted ceiling up to 1.75" NOTE: Confirm drawing dimensions prior to replacing a existing model as there are various models on market! Save hassle with what you think may replace!! Black Aluminum Pop-up vent mount flange size 11.88" L x 6.64" w x .75 h (cover down) Flange to bottom of handle depth with cover down at 2.93". Total height from flange to cover edge in open position at 2.75" Bi-directional, forward or reverse top opening. Mounting flange has a perimeter of holes for fastening, (10) 3/16" diameter. Top lid securely clamps down to prevent water entry, gasket-ed lid .Trim ring covers ceiling insulation depth up to 1.75" Plastic material, flange width 1.5". Trim ring inserts in from bottom side of vent.