JR Products 50015 Endura Range Vent - 5/8" Flange, Polar White UV stable/colorfast - will not yellow or become brittle when exposed to the elements Smooth, aerodynamic, contemporary design Push-lock, one-piece damper closure with large, sturdy hinges Wind tested to 190 mph Cutout Dimensions: 10-3/4" x 4"; Outside Dimensions: 12-9/16" x 5-7/8"