D4284 Steel Door With Louvers Door Type 3 Lock Type Cylindrical Material 18-gauge Thermal Insulation U-Factor 0.41 Door Opening Height 84 in Door Opening Width 48 in Thickness 1-3/4 in Agency Compliance ANSI UL For Use With Frames 3TFZ1 3TFZ3 3TFZ5 3TFZ7 Includes 24 X 60 in Louvers 7-3/8 in 39-5/16 in 71-1/2 in 42-7/16 in 84 in