MEMPHIS91, That looks really good, and a whole lot better than the temporary lash-up I used for my test. I look forward to your longer term impressions.
Would a thermal shot from further away, covering the length of the tube, show anything interesting? I wish I had a thermal camera. I'm jealous!
I think I will try a new test, logging temperatures for a longer period, perhaps a week. I don't think the top fan does anything so I might put that in a second tube for the new test (if I can find a tube).
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