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Can I run CAT5/6 cables parallel to electrical cables?
also, it is in part a safety issue. and you should always be incredibly hesitant to dismiss something as not being a safety issue.
Seebeck generator to run a fan on a radiator
You might want to, instead of taking a random DC fan, hit up DigiKey, and use their fancy search to try and find the highest CFM fan which consumes less power than the data sheet predicts your seebeck generator will produce in these circumstances. No sense fiddling around with heat transfer systems when you're wasting your collected energy on an inefficient fan. Not sure how the generator will interact with a BLDC fan, but stuffing a big electrolytic cap between the two almost certainly can't hurt. If the fan doesn't want to start, or stutters, definitely try a cap.