UL 793-2020 pdf free download.Automatically Operated Roof Vents for Smoke and Heat.
4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard.
5 Components
5.1 Except as indicated in 5.2, a component of a product covered by this standard shall comply with the
requirements for that component.
5.2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or
b) Is superseded by a requirement in this standard.uperseded by a requirement in this standard.
5.3 A component shall be used in accordance with its rating established for the intended conditions of use.
5.4 Specific components are incomplete in construction features or restricted in performance capabilities, Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions.
CONSTRUCTION
6 General
6.1 A roof vent shall be constructed to open during an internal building fire to facilitate venting of smoke and heat.
6.2 A vent shall be constructed to operate automatically, independent of electrical power or other energy sources that may be interrupted during a fire.
7 Materials
7.1 The nonmetallic materials used in a dome or cover(s) of a vent shall have the following properties:
a) They shall comply with the ultraviolet light exposure test in CAN/CSA C22.2 No. 0.17 and UL 746C. and
b) After the ultraviolet light exposure test, the materials shall:
1) Retain their physical properties as outlined in CANICSA C22.2 No. 0.17 and UL 746C (for example, retain their tensile strength and tensile impact, or flexural strength and Izod impact, depending on the type of material being tested), and
2) Have a minimum flammability rating of HB or better, in accordance with CAN/CSA C22.2 No. 0.17 and UL 94.UL 793 pdf download.