UL ratings for Tin-Clad Fire Doors

ULRatings: UL ratings for Tin-Clad Fire Doors

UL ratings for Tin-Clad Fire Doors

2.1 Sizes and ratings

2.1.1 The sizes and ratings for three-ply and two-ply doors are given in Table 2.1.

2.1.2 Table 2.1 pertains only to the maximum size of the opening. Doors limited in size by this table fall into two categories:

a)     Swinging doors intended to be installed within an opening and

b)     All sliding doors and those swinging doors intended for surface mounting outside of the opening.

Swinging doors in (a) are limited in size to the maximum dimensions specified for the opening. Doors in (b) must be larger than the maximum opening dimensions to provide the minimum 4 inch (102 mm) lap at each side and the top of the door as required by the Standard for Fire Doors and Fire Windows, ANSI/NFPA 80-1992. Doors exceeding these two basic dimension considerations are termed "Oversize," the design and construction of which are not necessarily fully covered in these requirements.

UL ratings for Tin-Clad Fire Doors end