We will use this rating in these comparisons even though it is not a real-world scenario simply because these figures are more widely known. The one they advertise is a “Free Air Rating” where the fan is tested without the duct and damper box attached. QuietCool fans are rated using two different methods of measuring CFM. Airflow Measured in Cubic Feet per Minute (CFM).Because of this more efficient way of regulating power, ECM motors see a significant energy use advantage when run at low speeds. ECM or Electronically Commutated Motor Instead of using a capacitor and brushes that wear out, an ECM motor is a brushless electric motor that is computer-controlled with a small circuit board for improved efficiency.This is not a very efficient motor type and gets little if any efficiency benefits from running at a slower speed. PSC motors are well known, low-cost type of motor that uses a capacitor to start and have limited options for speed controls.
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