As per NFPA 13 2013, 126.96.36.199 "exception" one can design to Ordinary Hazard 2 for powder coating but does not get into the ductwork portion of the design . I would imaging the 30gpm/15 psi would still apply but seems to defeat the purpose of the exception.
Also - I see that some treat the ductwork/stack 12'-0" max spacing run on the horizontal only. I interpret otherwise. Am I missing something?
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