D3656 Half Glass Steel Door Door Type 2 Lock Type Mortise Material 16-Gauge Thermal Insulation U-Factor 0.41 Door Opening Height 80 in Door Opening Width 32 in Window Height 25 in Window Width 19 in Thickness 1-3/4 in Agency Compliance UL 1 1/2 Hour Fire Rating 4-7/8 in 35-1/8 in 65-3/8 in