SECTION 907 FIRE ALARM AND DETECTION SYSTEMS
907.2 Where required-new buildings and structures.
907.2.4 Group F. A manual fire alarm system that activates the occupant notification system in accordance with Section 907.5 shall be installed in Group F occupancies where both of the following conditions exist:
1. The Group F occupancy is two or more stories in height; and
2. The Group F occupancy has a combined occupant load of 500 or more above or below the lowest level of exit discharge.
Exception: Manual fire alarm boxes are not required where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1 and the occupant notification appliances will activate throughout the notification zones upon sprinkler waterflow.
Please note, only a manual system is required; smoke detectors are not required. You may need a pretty beefy system to accomplish notification, but it's actually amazing to see how little is required in the various occupancies by the IBC, local amemendments not withstanding. Usually it's the insurance company that drives the automatic devices where they are not otherwise required.