Are the return vents under the plumbing area the furnace return vents? If that's the case, I don't think they would feed into the ducted AC system on the roof.
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Andy + Shari (plus our furry friends Goose and Huge). Fulltiming since 3/2020. 2020 Montana 3855BR. 2016 RAM 3500 SRW Tradesman with Tow/Haul package. Curt E16 Slider Hitch.
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