D3663 Half Glass Steel Door Door Type 1 Lock Type Cylindrical Material 18-Gauge Thermal Insulation U-Factor 0.41 Door Opening Height 80 in Door Opening Width 30 in Window Height 25 in Window Width 17 in Thickness 1-3/4 in Agency Compliance UL 3/4 Hour Fire Rating Includes Glass Not Included 6-5/8 in 37-5/8 in 68-5/8 in 36-15/16 in