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The fans already have a venturi, you might just need to extend the pipe (throat [¿]) but that would take a 2 stage die or some sort of hole put into the sheet to start with and a 20 + ton press. Blade design is horribly inefficient for turning windspeed into torque because they are generally a highly undercambered airfoil so you are using only part of the face of the blade. Proper selection of fan unit is required. Additional issue with cost: 100 fans @ $10 ea is a grand less shipping and taxes assuming you can get them for that price.
Engineering this to actually work is way past my old pay grade by a factor of ten
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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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