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When you open the basement wall, behind the furnace you will probably find a plenum with connections going to the various ducts. I would be surprised if one or more of the connections haven't come loose. Several folks have had that problem.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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