With one formula, you can find what fan is right for your home. This is the formula for fan CFM: Cubic feet per minute, more commonly known as CFM is calculated by the following formula: air speed (feet per minute) X area (square feet)=CFM. Not everyone is going to take a look at CFM, but for those who do it is a helpful tool. In simpler words than that of the formula, it is the amount of air a fan moves.
Here is a basic guide to help interpret the CFM number as it relates to air movement:
5,000 – 6,000 CFMs = decent to good air movement.
6,000 – 7,000 CFMs = good to very good air movement. For those looking for a fan that can be used daily, perform well and provide good air movement, I would expect a 52” ceiling fan to move at least 6,000 cfms.
7,000 – 8,000 CFMs = excellent air movement.
8,000+ = exceptional air movement. Generally, only fans with the largest diameters (72, 82, 90”) fans will offer this kind of air movement because they not only move a substantial quantity of air but they also push the air over the largest surface area.