1.1 These requirements cover heat-actuated, single and multiple station heat alarms intended for indoor installation in accordance with:
a) In Canada:
1) The National Building Code of Canada,
2) The National Fire Code of Canada,
b) In the United States:
3) The National Fire Alarm and Signaling Code, NFPA 72
This new edition of ANSI/UL 539 dated June 23, 2022 has been issued to incorporate changes from proposals dated May 21, 2021 and October 15, 2021.
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