The 2007 Edition of the National Fire Alarm Code® provides guidance for System Sensor’s ExitPoint™ directional sounders.
The life-safety benefit of directional-sound technology is recognized by the National Fire Protection Association in language that addresses exit-locating systems in the 2007 edition of NFPA 72, National Fire Alarm Code®.
System Sensor’s ExitPoint™ sounders, which fall under the category of exit-marking audible notification appliances, emit nonverbal cues to lead people to an exit in the event of a fire.
The 2007 NFPA 72 substantiates the inclusion of these directional-sound devices in Chapter 6, Protected Premises Fire Alarm Systems, Section 22.214.171.124 Exit-Marking Audible Notification systems, which states: Where required, exit-marking audible notification appliances shall be activated by the building fire-alarm system.
Other areas of the 2007 NFPA 72, including chapters 7 and 10, address the standards to define exit-marking audible notification appliances, as well as code-complying maintenance practices.
Figure A: Interaural time and intensity differences of sound
Figure B: Examples of frequency-dependent attenuation for sources in front, above, and behind the listener.
Figure C: Comparison of frequency content of a traditional fire-alarm sounder to a directional sounder
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