I think you should keep the vents open or at least two of them. I think this is a really rare occurrence and chances of it happening again are slim. For peace of mind a little box of D Con might be a good idea.
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2011 Eagle 330RLTS with just about every option.
2017 Silverado 1500 4x4 5.3 with tow package. (no, we don't tow the Jayco with it.)
2018 Surveyor 265RLDS well equipped.
Life in the slow lane is still life.
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