These requirements cover the design and construction details of tin-clad fire doors which when so fabricated have demonstrated in fire tests conducted in accordance with the Standard for Fire Tests of Door Assemblies, UL 10B , fire performance properties which warrant their use as fire doors having a rating of 3, 1-1/2, or 3/4 hour. The doors covered by these requirements are intended to be mounted with fire door hardware of the following types:(a)Sliding hardware and (b) Swinging hardware.