How can the 110 decibel maximum at minimum hearing distance be accommodated in loud environments where the ambient exceeds 95 decibels?

Blog Post created by barrychase Employee on May 8, 2019


In my recent NFPA® Live I discussed the selection and location of audible fire alarm appliances to help meet the audibility requirements of NFPA 72®, National Fire Alarm and Signaling Code®, 2019 edition. Participants learned the how to determine the minimum sound pressure level for the fire alarm system in a given space and how to account for the effects of hearing distance, wall configuration, and reverberation in the selection and location of audible notification appliances.

I received this follow-up question from a member. I hope you find some value in it.


NFPA Live is an interactive video series in which members of NFPA staff address some of the most frequent topics they receive through the Member's Only Technical Question service. If you are currently an NFPA Member you can view the entire video by following this linkIf you're not currently a member, join today!