displacement). To visualize it: CFM is the amount of cubes of air (a foot high, wide and long) the range hood could suck in per minute. The higher the CFM of a range hood, the more cubes of air it can suck in within one minute, and therefore the more powerful the range hood.
Is it important to know how much CFM you need? Yes, it's very important to know the amount of CFM you will need BEFORE you're going to shop for a range hood, because range hoods are generally made with a fixed amount of power. That means you can't pick a certain model and consequently pick the amount of CFM for it. You will have to figure out the amount of CFM your kitchen needs beforehand and pick a range hood model which matches that specific amount.
Now, a lot of us are immediately tempted to order the most powerful one. How impressive would it be to have a fancy commercial grade exhaust vent above our stove, right? Not only is it that a really bad idea, it’s actually dangerous.
What does CFM mean for range hoods? CFM is short for Cubic Feet per Minute, which is an indication of the power of a range hood.