I could use a bit of help trying to understand the code requirement for fire dampers at shaft walls. I was reviewing a building air system design that includes a duct riser that extends from the roof down three floors. The shaft wall is noted as 1-hour rating (as expected). I understand in a fully sprinklered building, ducts that penetrate 1-hour walls do not require smoke dampers. Is the same true for shaft walls? I looked through NFPA 90A, but I could not seem to get a clear answer (the diagram does not provide any insight). Perhaps I am overlooking the obvious. Any assistance you can provide is greatly appreciated. Thank you.
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