D3679 Vision Lite Hollow Steel Door Vision Lite Door Type 3 Lock Type Cylindrical Material 16-GaugeThermal Insulation U-Factor 0.41 Door Opening Height 84 in Door Opening Width 48 in Window Height 29 in Window Width 31 inThickness 1-3/4 inAgency Compliance ANSI A250.8-1998 UL For Use With Frames 3TFZ1 3TFZ3 3TFZ5 3TFZ7 Includes 1/4 in Clear Wire Glass with Safety Film Fire Rated For 90 Minutes7-3/8 in 39-5/16 in 71-1/2 in 39-15/16 in84 in