D3633 Vision Light Steel Door Door Type 3 Lock Type Mortise Material 18-Gauge Thermal Insulation U-Factor 0.41 Door Opening Height 84 in Door Opening Width 36 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