D3529 Flush Steel Door Door Type 1 Lock Type Mortise Material 16-Gauge Thermal Insulation U-Factor 0.41 Door Opening Height 84 in Door Opening Width 32 in Thickness 1-3/4 in Agency Compliance UL 3 Hours Fire Rating 6-5/8 in 39-5/8 in 72-5/8 in 40-15/16 in 38-7/16 in