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Can anyone define coverage for a wet chemical system in a common exhaust duct?

Question asked by David Warren on Jul 13, 2016
Latest reply on Jul 27, 2016 by Paul Smith

How should wet chemical systems be installed to properly protect several kitchen hoods that connect to a common exhaust duct that travels more than 75 feet to discharge.  NFPA 17A identifies that the entire common exhaust duct must be protected but a wet chemical system is proposed only for the point of connection to the common exhaust duct.  Does the remainder of the duct have to be protected with wet chemical systems?

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