We have an AHJ that is requiring a sprinkler be located in a grease exhaust duct - but I'm finding it difficult to see where this would be required (reviewed NFPA 96 and 13).
The duct serves a Type I kitchen hood, has an Ansul suppression system, and then has a roughly 45 foot run to exhaust to the outside. We haven't come across a requirement for a duct run like this before, is it required?
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