UL 793

May 11, 2021 by No Comments

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Product Details

Edition:
4
Published:
12/15/2020

UL 793

September 11, 2020 by No Comments

Click here to purchase
Please note: All interim revisions for this edition available at time of your purchase will be included.

Automatically Operated Roof Vents for Smoke and Heat

UL 793

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.

Product Details

Edition:
3rd
Published:
12/31/2008
Number of Pages:
14