I have a submittal for a vane axial direct-drive fan that has a fan speed of 1,654 RPM, but the motor speed is only 1,200 RPM. The vendor tells me this is "quite common" and that all you need to do it crank up the VFD past 60HZ until you reach the desired fan speed. Does this sound right? As I recall, torque takes a nosedive above 60Hz. I don't know how that translates back to the fan curve, but I am concerned with the motor selection.
Does anyone have experience with this?
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