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UL 33-21 Heat responsive links for fire-protection service

Publication Year

2021

Document Status

Current

Abstract

Specifies heat responsive links used for fire-protection, intended for use with automatic fire suppression systems or automatic closure devices for doors, windows, dampers or smoke relief vents.

Document History

Revised October 31, 2022.

Publisher Information

Underwriters Laboratories

Established in 1894 as the Underwriters' Electrical Bureau, UL is a global safety consulting and certification company, approved to perform safety testing by the U.S. federal agency of Occupational Safety and Health Administration.

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