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:-/ I would think you would want all the suction power you could get so the ability to turn on less than all of the fans would have no real advantage. Just wire them all together. That also eliminates purchasing and mounting separate switches for each fan. Make sure the wire you use is rated for more than the sum of the amps drawn by each fan. I would also wire nut AND tape each termination to keep the dust out of the connections. Keep the fans, switches, and terminations clean, free from dust accumulation as the dust is a source of ignition if something overheats. Your dust collector could become a flame thrower!
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