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Old 12-16-2023, 05:05 PM   #3 (permalink)
j-c-c
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My first thought for the OP, since all heat rises, and sounds like trapped heat escaping is an issue, how about restricting cold air rising from the bottom, ala an engine compartment area belly pan on steroids? Based on other threads here, if able to handle the heat, it could be stretched fabric?
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