Just add to my last statement in above post:
It would be best if FPPA 22(2) did not apply to fire alarm system audibility upgrades (system alteration) essentially triggering compliance with new/current OBC when owner applies for a building permit as per FD Order, OR maybe it would be best if current version of the Fire Code was amended to include provisions for audibility upgrades to at least meet OBC 1997; forget the 2015 OBC audibility requirements (if you didn’t know, both requirements are almost the same for audibility levels).
Oh and OFM audibility technical guideline is just a guideline nothing more and should not be interpreted as law or at least that’s what lawyers say…
Again, thoughts?