What is your opinion regarding emergency voice intelligibility requirements? We have been reviewing the 2013 NFPA 72 chapter 24 as well as some ANSI standards regarding Speech a Transmission Index STI and Common Intelligibility Scale CIS test parameters and design modeling tools.

Are the AHJs basing intelligibility on a subjective walk through? Or are they looking for a proper CIS field test with empirical data to support compliance?

Also what us your opinion regarding Acoustically Distinguishable Spaces as applied to retrofit?
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