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Question on HVAC supply duct that needs to move

last year

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.

Featured Answer

mike_home

last year

It is going to require a custom solution.

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Comments (8)

mike_home
last year
I don't think there is a code which states a supply duct cannot be within an outside wall. I will defer to the code expert on this one.

If it is allowed, then it becomes more of heat loss and gain issue. Are you able to build a chase on the exterior wall so it states inside the conditioned envelope?
Eric Jackson
Original Author
last year
Thanks Mike, That would be a no on the chase, I don't want to get into modifying the exterior. There are interior options that exist, but they do take away from the overall appearance of the kitchen layout.

FYI - I have had conflicting information on whether this is a code violation or just a "not preferred" due to efficiency losses.
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PRO
Charles Ross Homes
last year
Best practice is to not install HVAC ducts or plumbing in exterior walls. I don't think the 2018 IRC prohibits installation of ducts in exterior walls provided they are insulated to code required R-values. If you are not able to do that, your cabinetmaker may be able to leave a void space at the rear of cabinets to accommodate the duct work.
Eric Jackson
Original Author
last year
Thank you for this feedback. I think this helps clarify the comments I have heard.
mike_home
last year
It is common in many parts of the US to install duct work in the attic. Attic temperatures can reach 0ver 125 degrees in the summer, and below 40 degrees in the winter. This is a bigger temperature swing than you would see in a exterior wall cavity. The duct work used in attics usually has a R6 or R8 rating. You should be fine if you can install an similar amount of insulation between the duct and the exterior wall for a short run.
Eric Jackson thanked mike_home
PRO
Charles Ross Homes
last year
In a 3 1/2" stud cavity there simply isn't room for a reasonably sized duct insulated on all sides.
Eric Jackson thanked Charles Ross Homes
Eric Jackson
Original Author
last year
Thanks all who commented. The exterior walls are 2x4 construction, so as mentioned above, with insulation, there’s no room left for a duct in exterior wall.

I’m going to work with a cabinet supply designer on a couple of options to hide the duct within the cabinetsbinders.

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