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Phil, my Ob has a sealed floor but natural ventilation around the roof edge, no fans, and I don't get the issue. I think you are maybe getting too much evaporation chilling as the sun comes up. I would try blocking the perforated floor for a starter which might also stop ground moisture coming up during the night and permeating everything. Cheap test fix with an old plastic sheet might help. I have a blue plastic tarp down first, then a sheet of card board just to protect the sheet then carpet tiles on top ( free chuckouts during work upgrade). No problems and Auckland is renowned for dew.
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