Cubic feet per minute or 'CFM' is the unit used to measure the airflow of a ceiling fan. The greater the CFM, the more air that is being moved. The Blade Size and Shape, Blade Pitch and Motor Performance are essential for superior air movement. At Hunter Fan Company, we are constantly testing the combination of these three elements to maximize the performance of our products. From the number and shape of the blades to the motor size, the slightest change can make a difference in a fan's overall functionality and ultimately creating the perfect level of comfort.