D2855 Steel Door with Louvers Door Type 1 Lock Type Mortise Material 18 -gauge steel Thermal Insulation U-Factor 0.41 Door Opening Height 80 in Door Opening Width 36 in Window Height 12 in Window Width 12 in Thickness 1-3/4 in Includes 12 x 12 in Louvers 6-5/8 in 37-5/8 in 68-5/8 in 36-15/16 in 34-7/16 in