D3719 Half Glass Steel Door with Glass Door Type 1 Lock Type Cylindrical Material 18-Gauge Thermal Insulation U-Factor 0.41 Door Opening Height 84 In. Door Opening Width 32 In. Window Height 29 In. Window Width 19 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. 40-15/16 In.