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Fire alarm notification appliance: Difference between revisions

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Alerting methods include:
* Sound (audible signals)
** 95 dB @ 3,100 Hz tone are used in many current notification devices.<ref name="NFPA.org">{{cite web |title=The Time of Activation of Smoke Alarms in Houses - the effect of location, smoke source, alarm type and manufacturer, and other factors |url=http://www.nfpa.org/~/media/files/research/research%20foundation/foundation%20proceedings/the_time_of_activation_of_smoke_alarms_in_houses-thomas_and_.ashx |url-status=dead title|archive-url=NFPAhttps://web.archive.org/web/20140508224423/http://www.nfpa.org/~/media/files/research/research%20foundation/foundation%20proceedings/the_time_of_activation_of_smoke_alarms_in_houses-thomas_and_.ashx |archive-date=2014-05-08}}</ref>
** 80 dB @ 520 Hz tone are used in newer notification devices.<ref name="NFPA.org"/>
** 70 dB to 100 dB weighted for human hearing (higher decibels, in the 100 to 115 dB range, were common with older electromechanical horns){{Citation needed|date=January 2008}}
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