If emergency warning systems are provided, they must include both audible alarms and visual alarms complying with NFPA 72 and Chapt. 9 Sections 907.9.1 & 907.9.2
CBC 1114B.2.2 2010 ADA 702.1

In existing facilities, existing alarms must be installed only when an existing fire alarm system is upgraded or replaced, or a new fire alarm system is installed.
2010 ADA  215.3

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