I added a second 15 I btu AC to our 34tbok myself, and it was easy to make it ducted. They simply foil tape off the duct work where you'd tie in the second AC. Actually, if not adding a second AC, I think I'd still open up the fan, or ceiling ducts, and seal it up so air isn't going further forward in the ductwork then needed.
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Joel and Teresa
2016 Sabre 34TBOK
2006 GMC 3500 CC LB DRW 4X4
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