UL 793:2020 free download STANDARD FOR SAFETY Automatically Operated Roof Vents for Smoke and Heat
1 Scope
1.1 These requirements cover automatically operated roof vents for smoke and heat that fall into two general categories: mechanically-opened and gravity-opened. Mechanically-opened vents consist primarily of a body frame, one or more damper covers and hatches, and operating mechanisms which generally include a heat responsive device and spring(s). Gravity-opened vents consist primarily of a body frame and nonmetallic drop-out panel. The vents covered by these requirements are operated manually or automatically in the event of fire to remove smoke and heat from the building. Automatic operation does not depend on electrical power or other energy sources that may be interrupted during a fire, but rather depends upon operation of a heat responsive device or on the action of a plastic cover shrinking and falling from place due to fire exposure, or the like. These vents are not intended for use as general purpose building ventilation devices.
2 Normative References
CSA Group Standards
CAN/CSA C22.2 No. 0.17, Evaluation of Properties of Polymeric Materials
UL Standards
UL 33, Standard for Heat Responsive Links for Fire-Protection Service
UL 94, Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances
UL 746C, Standard for Polymeric Materials – Use In Electrical Equipment Evaluations
UL 790, Standard for Standard Test Methods for Fire Tests of Roof Coverings
UL 1332, Standard for Organic Coatings for Steel Enclosures for Outdoor Use Electrical Equipment
Other Standards
International Building Code
NFPA 204, Standard for Smoke and Heat Venting
ASTM A653/A653M, Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process
ASTM B555, Standard Guide for Measurement of Electrodeposited Metallic Coating Thicknesses by the Dropping Test
ASTM E11, Standard Specification for Wire Cloth and Sieves for Testing Purpose
3 Units of measurement
3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information.
4 References
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.
UL 793:2020 free download
