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Question on HVAC supply duct that needs to move

Eric Jackson
last month

We're in the planning stages of a major kitchen remodel and have found a HVAC supply duct for the 2nd floor which needs to be relocated. I've been told it cannot be located on an "outside wall" due to inefficiencies (heat loss in winter, cooling loss in summer). From a kitchen design standpoint it wants to be as close as possible to an outside wall while still meeting code.

My question is - how close can it be to an outside wall? What are the specifics (distance, insulation, air gap, drywall, etc.)? Any examples would be a bonus.

FYI - location code here for Michigan is to meet the the 2015 International Mechanical Code.

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