D4277 Steel Door With Louvers Door Type 1 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 3TFX 4 3TFX5 3TFX8 3TFX9 Includes 12 X 12 in Louvers 6-5/8 in 39-5/8 in 72-5/8 in 40-15/16 in 84 in