UL 1275-2021 pdf free download.Flammable Liquid Storage Cabinets.
4 General
4.1 Cabinet construction shall comply with either Metal, Section 5, Wood or Section 6. Any cabinet type shall be subject to all the performance tests in this standard.
4.2 For all construction methods, a cabinet may be provided with a means for attaching a ground lug, ground wire, bond wire, or other device at the base of the cabinet on the outside to provide static electric charges with a discharge path to the building ground.
4.3 For all construction methods, a cabinet may be provided with vents as specified in (a), (b), or (c). If included, such vents shall be provided with removable plugs that shall remain in place unless the cabinet is connected to a ventilation system. When provided the vent location(s) shall be:
a) Two diametrically opposed side vents located on opposite sides of the cabinet,
b) Two vents located on opposite sides of the back,
c) Two vents, one upper and one lower, or
d) A single bottom rear vent.
4.4 The heat responsive link for self-closing doors shall comply with the Standard for Heat Responsive Links for Fire-Protection Service, UL 33, or the Standard for Fusible Links for Fire-Protection Service, ULC-S505 and be rated for a low or ordinary temperature classification.
4.5 Cabinets shall have self-closing doors.
4.6 Adjustable shelf support brackets shall be secured, double locked, or screwed in.
5 Metal
5.1 The bottom, top, door and sides of the cabinet shall be at least 0,042 in (1,07 mm) thick sheet metal.
5.2 The construction shall be double walled with a 1-112 in (38 mm) air space.
5.3 All joints shall be riveted, welded, or of an equally effective construction.
5.4 Doors shall be provided with a three-point locking arrangement and the door sill shall be located at least 2 in (51 mm) above the bottom of the cabinet.
6 Wood
6.1 The bottom, sides, and top shall be constructed of exterior grade plywood at least 1 in (25 mm) thick of a type that resists breakdown or delamination under fire conditions.
6.2 All joints shall be rabbeted and fastened in two directions with wood screws and where more than one door is used, there shall be rabbeted overlap of not less than 1 In (25 mm).
6.3 Doors shall be equipped with a means of latching and hinges shall be constructed and mounted in such a manner as to not lose their holding capacity when subjected to fire exposure.UL 1275 pdf download.