Hollow metal doors shall be constructed of 12 to 14 gauge steel inside the security perimeter. 18 gauge hollow metal doors may be used outside the security perimeter. Plate doors shall be constructed of material not less than 3/16 inches thick. The security quality of each detention door shall be determined by the level of security sought to be achieved. Detention doors shall be equipped with detention hardware and accessories. All cell doors shall be not less than 28 inches in clear width and not less than 6 feet 8 inches high.