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Is there a reason you want so much extraction power? I think that would be capable of about 2000CFM, try turning the heat down a little. That is a lot of air to replace, hope you do not have a fireplace.
With the VFD's you would run a remote on off switch and a potentiometer, can use standard rocker switch, and keep the controller close to the motor. Is there anywhere you can hear one of the fans you are looking at running?
Could you run two smaller fans branched through a y? Run one for low and both for high?
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87 930,
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