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If you don't unblock them in the winter the furnace will get the return air it needs from the outside and IMPO you don't need cold outside air coming in thru all the cracks anymore than already does.
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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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