D2864 Steel Door with Louvers Door Type 1 Lock Type Mortise Material 18 -gauge steel Thermal Insulation U-Factor 0.41 Door Opening Height 84 in Door Opening Width 36 in Window Height 24 in Window Width 24 in Thickness 1-3/4 in Includes 24 x 24 in Louvers 6-5/8 in 39-5/8 in 72-5/8 in 40-15/16 in 38-7/16 in