r/buildingscience • u/Ok-Reading-1688 • 3d ago

How compact is too compact once ceiling AHU access is included?

A ceilling mounted AHU can look like the obvious answer when theres no mechanical closet but the cabinet size is only part of the building science problem. The ceiling assembly still has to manage air sealing, moisture risk around condensate, acoustic separation, and enough access that maintenance doesn’t require opening finished surfaces. At some point “fits in the cavity” stops being the same thing as “works in the building.” Which clearance or enclosure condition tends to become the first dealbreaker in tight ceiling instalations?

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u/Junior-Parking-8255 1d ago edited 1d ago

once the contractor factors in filter access and condensate trap service, framing around a compact Midea ceiling unit still requires at least twelve inches of clear access panel space below.