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Yes, air flow is necessary for safety so blocked registers will keep the furnace from working. That's why we could run the furnace with the slides in on our old rig and we can't on our new one.
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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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