AC179 Metallic HVAC Duct Enclosure Assemblies—Approved June 2012, editorially revised Feb 2014 (PDF Download)
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AC179 establishes guidelines for evaluation of rigid or flexible fire-protection enclosure systems that are installed on or as part of metallic HVAC ducts, yielding an alternate to required fire-resistance-rated shafts which are required to be protected from both internal and external fire exposure.