Please note: All interim revisions for this edition available at time of your purchase will be included.
Single and Multiple Station Heat Alarms
UL 539
1 Scope
1.1 These requirements cover heat-actuated, single and multiple station heat alarms intended for indoor installation in accordance with the National Fire Alarm Code, NFPA 72, Chapter 11.
1.2 These requirements do not cover electrically operated single or multiple station smoke or heat alarms.
