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A variable frequency drive fan controller review should start with the fan, not the controller. Facilities often purchase a VFD to reduce energy use or gain speed control, then discover the motor is not compatible, the fan is operating too far left on its curve, or the control signal does not reflect the actual heat or ventilation load. A drive can be one of the highest-value upgrades in a ventilation system, but only when it is matched to the motor, fan curve, electrical service, and operating …