D4276 Steel Door With Louvers Door Type 2 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 3TFY1 3TFY3 3TFY7 3TFY9 Includes 12 X 12 in Louvers 4-7/8 in 35-1/4 in 65-3/8 in 36-1/4 in 80 in