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I did the exact same Mod on my duct work on my current and last rig. That is the way the AC ducts are built on all units I have seen. They basically run a ceiling duct (one size fits all) the entire length of the ceiling and the vent openings are placed where ever they need to be based on the model. Not exactly efficient. I experienced at least a 30 percent flow improvemen. My 15k AC cools my 37 foot fifth wheel with no problem.
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