D3682 Vision Light Steel Door with Glass Door Type 3 Lock Type Cylindrical Material 18-Gauge Thermal Insulation U-Factor 0.41 Door Opening Height 84 in Door Opening Width 30 in Window Height 11 in Window Width 11 in Thickness 1-3/4 in Agency Compliance UL 1 1/2 Hour Fire Rating 7-3/8 in 39-5/16 in 71-1/4 in 42-7/16 in