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Originally Posted by solarhotairpanels
...documenting how I constructed my latest solar hot air collectors and my solar hot water drainback system...
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Thanks for the PDFs. I think it's more useful to readers of your work if the discussion happened in the open, so that everyone learned from the questions & responses, rather that just individuals.
Having said that, have you had your metal-stud hot air collectors in operation long enough to know how they stand up to the wind and weather?
-AC