Door Louver, Intake or Exhaust, Louver Overall Height 18 1/8 in, Louver Overall Width 22 1/4 in, Flange Width (In.) 1 3/16 in, Louver Cutout Height 16 1/2 in, Louver Cutout Width 20 1/2 in, Louver Door Thickness 1-3/8 in to 2-1/4 in, Louver Free Area 1.27 sq ft, Steel Louver Material, Number of Blades 30, Gray Paint Finish, Blade Angle (Deg.) 45, For Use With New or Existing Doors, Includes Fasteners