If I have a Type IIB construction, 2 story office building and run ductwork from a roof top unit through the upper floor and want to conceal this duct within the building construction (in a dead space or chase), do I need shaft construction, dampers, etc... Please indicate what exception I would use & how to get there, all the way to the final conclusion
I want to install ductwork within building construction without a shaft enclosure
Section 707.2 Exception #4, no shaft required.
All openings through nonfire-resistance-rated floor/ceiling assemblies must be protected by a shaft enclosure.
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