black aluminum low profile popup air flow roof vent trailers, rv, trim ring & gasket generic 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.