903.4.2 Alarms. Approved audible devices shall be connected to every automatic sprinkler system. Such sprinkler water-flow alarm devices shall be activated by water flow equivalent to the flow of a single sprinkler of the smallest orifice size installed in the system. Alarm devices shall be provided on the exterior of the building in an approved location. The alarm device shall be marked with a sign which reads “FIRE ALARM – CALL 911”. Where a fire alarm system is installed, actuation of the automatic sprinkler system shall actuate the building fire alarm system.