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Really do not think you need 220v, unless you are going 2hp. The best way to get variable speed is with a variable frequency drive, the variable transformer similar to that Fantec will work but the motor will likely Hum at lower speed, it is reducing voltage vs changing the frequency. Some VFD are NEMA 4 so sort of have their own enclosure but still need space around them for cooling, and with most you can wire the on switch and potentiometer to a remote location. Look up 120v vfd will need to make sure the fan motor will work properly with one.
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