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We had no problem with running with the furnace on with our 3665RE, but can't do it with our 3720 due to three of the vents being covered when the slides are in. Besides the other issues, not enough air flow will cause the sail switch to shut the furnace down, the furnace to over heat or who knows what else.
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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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