NFPA-17A- 4.4.3.5-- Exhaust fans do not need to be shut down on deployment of the wet system.
But in 5.6.2.2- all fuel and heat sources MUST be shut down. easy to shunt trip the panel. 4.4.3.4- solid fuel- needs no shut down.Fancy Pizza joint--(Joint mmmm) 4.4.3.7- requires all shut down devices need a manual reset. shunt trip brkr, coverd.