The kitchen exhaust system standard requires that the exhaust fan come on or stay on when the suppression system discharges unless the fire extinguishing system manufacturer requires shut down as part of the instructions included with the listing and labeling of the hood system. Use the hood system dry contact to re energize the exhaust fan motor contactor. If the exhaust fan is controlled by a manual motor control switch wire a load rated contactor in parallel with the manual switch and use the hood system dry contact to control the contactor.
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Tom H
