D3712 Half Glass Steel Door with Glass Door Type 3 Lock Type Cylindrical Material 16-Gauge Thermal Insulation U-Factor 0.41 Door Opening Height 80 In. Door Opening Width 36 In. Window Height 25 In. Window Width 19 In. Thickness 1-3/4 In. Agency Compliance UL 1 1/2 Hour Fire Rating 7-3/8 In. 37-5/16 In. 67-1/4 In. 38-7/16 In.