CFM is an abbreviation for cubic feet per minute. It measures the speed of airflow. More speficially, CFM ratings tell us how fast air can be moved out of a room. Many of our customers ask us about CFM suction power and why we don't list it in our descriptions. Suction power definitely matters when it comes to finding the right range hood! However, there’s no clear international standard for CFM. Manufacturers also use different testing environments and labs. CFM ratings vary based on kitchen setup, venting, windows, and more. In fact, you could test the same range hood in the same kitchen and change an element (such as closing a window) and get a different CFM reading. That’s why we recommend selecting your rangehood based on your cooking needs.