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On our rig, as stated by David, that's a air transfer vent not a heating vent. Since I did want a vent down there I drilled three holes in the heating duct that runs across the basement ceiling, spaced evenly across the basement.
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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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