D4281 Steel Door With Louvers Door Type 3 Lock Type Mortise Material 18-gauge Thermal Insulation U-Factor 0.41 Door Opening Height 80 in Door Opening Width 48 in Thickness 1-3/4 in Agency Compliance ANSI UL For Use With Frames 3TFY9 3TFZ2 3TFZ4 3TFZ6 Includes 24 X 24 in Louvers 7-3/8 in 37-5/16 in 67-1/4 in 35-15/16 in 80 in