UL 539-2009 pdf download.Single and Multiple Station Heat Alarms. 3 Glossary For the purpose of this standard the following definitions apply. 3.1 ALARM SIGNAL – An audible signal intended to indicate an emergency fire condition.
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UL 539-2009 pdf download.Single and Multiple Station Heat Alarms. 3 Glossary For the purpose of this standard the following definitions apply. 3.1 ALARM SIGNAL – An audible signal intended to indicate an emergency fire condition.
Read more