Apart from the Vent-A-Hood that uses one wide and powerful motor to do most of the work, the later models come with two engines and fans. The fan system has adjustable speed settings.
Higher speeds suits cooking that has large vapor deposits or the intense aromas. The only issue you have to deal with is the extra noise. However, we have quieter options even at the highest speed which allow you to evade such a problem.
The range hood motors are responsible for rotating the fans and increase the airflow. The amount of air taken in is what the designers’ measure in CFM (Cubic Feet per Minute). Higher CFM values dictate that the range hood is capable of getting rid of the fumes and hot greases emitting from the cooker area.