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.