Description This sturdy mill finish aluminum ventilator pops open at an angle by pushing on an 10" wide inside bar. Overall measurements are 7-3/4" x 13-3/8" Cutout in trailer is 5-3/4" x 11-1/4" It protrudes 2-1/2" when closedWhen it is open, it extends a total of 5"Lid is gasketed for an air-tight closure. It has a built in screen.