Let me know if you come across a good design for one. I'm considering basically doing the same thing in my "spare" time....whenever that might be. I'm stockpiling small amounts of copper each day. If you need a fan I have pulled a bunch of working fans out of dehumidifiers that have about a 12" diameter and run fairly quiet. They also come mounted on a bracket that can easily be attached to a homemade housing. Always willing to share ideas and materials
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