D3634 Vision Light Steel Door Door Type 3 Lock Type Cylindrical Material 18-Gauge Thermal Insulation U-Factor 0.41 Door Opening Height 80 in Door Opening Width 48 in Window Height 11 in Window Width 11 in Thickness 1-3/4 in Agency Compliance UL 1 1/2 Hours Fire Rating Includes Glass Not Included 7-3/8 in 37-5/16 in 67-1/4 in 38-7/16 in