simple man has said that well. I'd only add that I like to make sure I am getting good flow across the tub so at the back where I have the hot side I have holes low in the side and high in the front. as the air rises it will draw in fresh air and the hot air will exit via the top holes in the front. It generates a gradient where I am the room temp where the rack is is quite cool so it also limits the amount of the cool air entering the tub. The air from the back is partially heated by the flexwatt at the back.
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