D3686 Vision Light Steel Door with Glass Door Type 1 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 6-5/8 in 39-5/8 in 72-5/8 in 38-7/16 in