SECURALL heavy-duty steel doors are built with the highest standards in quality, design and functionality. Our doors are constructed of 18 gauge galvannealed steel and have vertical steel stiffeners inside the door panel for extraordinary strength and durability. SECURALL 18 gauge doors are Level 2 Heavy Duty as defined by the Steel Door Institute. They are appropriate for use in hotels, offices, schools and hospitals. Extra Heavy Duty 16 gauge doors are also available as well as Maximum Duty 12 gauge doors for higher security applications. For corrosive or saltwater environments, we offer stainless steel doors and frames in both type 304 and type 316 stainless. Optional insulation is also available for exterior applications. R9 rigid foam is used for non-rated doors and R6.5 rockwool is used for fire rated doors.