Six Panel Security Door Door Type Embossed Steel Lock Type Mortise Material 18-gauge Steel Thermal Insulation U-Factor 0.091 Door Opening Height 84 in Door Opening Width 36 in Thickness 1-3/4 in Agency Compliance UL 1 ANSI 250.8 1-1/2 hr Fire Rating For Use With Mortise Locks with Full Escutcheon Plate