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I’d try one step at a time- I’ve heard it said that the fans aren’t necessary if its wrapped so maybe try the wrapping first as it’s a lot cheaper/quicker solution. Also, fans are going to be pumping moist air into the tube so I imagine that could cause issues too?
I’m pretty any insulating wrap would work as they are pretty much all either foam or plastic with closed cell air gaps (obviously the insulation I use consists of billions of much smaller air gaps, but still the same principle). I’ve seen one guys uses yoga mats on his ota with apparent success.
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