D4276 Steel Door With Louvers Door Type 1 Lock Type Cylindrical 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 3TFX2 3TFX3 3TFX6 3TFX7 Includes 12 X 12 in Louvers 6-5/8 in 37-5/8 in 68-5/8 in 36-15/16 in 80 in