I thought about that but the velocity of the air would increase creating
more noise. the other option would be to bend the fan blades to reduce the
pitch.
I think a variable speed fan motor would be way handy. If you shop used
(ebay) a three phase motor and VFD control would be one way to go.
Another route would be a DC motor and speed control. A place called surplus
center has them both.
Karl
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