Sorry for being MIA for awhile.......I also noticed this, but if you are using the furnace I would recommend NOT blocking them off as they are technically used for cold air return to the furnace, but if you are not using furnace I would be ok to cover them , I use a section of memory type foam wrapped in material that closely matches the interior to cover them when we are not running the furnace, it seems to work pretty well
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2021 Riverstone Legacy 39RKFB / 2021 Ford F350 6.7L DRW / 2021 Palomino 2910
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