Imho, for you, the best bet would be a re motored 20" box fan arrainged into a wall. Dc brushed small PM motors are cheapish and available salvage as would be car alternaors. I wouldn't expect much wattage output, however unless your area is 20 mph windy.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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