Duct insulation for paint booth

[fireguy]

A customer called today asking where to get insulation for the paint booth exhaust duct. This is being required by the building inspector.

I have gone through my copy of the Oregon Mechanical Specialty Code 2010, based upon the ICC 2009 Mechanical Code. I do not find any mention of requiring duct insulation on paint booth ducts. Commercial kitchen, yes, booths no.

I do not have my copy of the NFPA paint booths with me, as I am working out of town.

But I do not remember any requirements there for duct insulation

 

[Dr. J]

Perhaps what is meant is a fire rated wrap. As a Hazardous Exhaust (IMC), no fire dampers are permitted, so the duct must be enclosed in fire resistive construction from the point of penetration of any rated construction to the outside.

NFPA 33 states "Exhaust ducts shall follow the most direct route to the point of discharge but shall not penetrate a fire wall." The fire resistive rated enclosure would essentially extend the fire wall (NFPA's term, not I-code) to the exterior so there would be no penetration.

As is always my advice to "the inspector is requiring ... " - Code section please.

 

[Yankee]

What Dr. J said

here's one

ICC ESR-1255