I haven't spent any storage time in the deep south, but I have Maxx vent covers for my Fantastic Fans and I leave them open 24/7/365 while in storage. I have done this with my last trailer for a total of 19 years and have never had a mold or cooped up smell issue. I know your humidity is higher, longer down there, but with two vents open, enough air seems to move to be effective.
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-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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