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Fan Calculations – Measure Airflow with CFM

With one formula, you can find what fan is right for your home. This is the formula for fan CFM: Cubic feet per minute, commonly known as CFM, is calculated using the following formula: Air velocity (feet per minute) X area (square feet) = CFM. Not everyone will look at CFM, but it’s a helpful tool for those who do. In simpler terms than a formula, it is the amount of air that a fan moves.

Airflow depends on other factors, such as the size and shape of the blades, the rotational speed of the blades (revolutions per minute or rpm), the horse power (hp) of the motor, and the overall design of the fan. These combined factors establish the air movement capacity of a fan. Fan capacity is measured in cubic feet, and again, thus CFM (cubic feet per minute).

CFM and RPM are the two most important things to look for in a fan to ensure proper and efficient operation. If you only know RPM, and not CFM, or vice versa, you should be confident in buying your fans. As long as you know one of the calculations, you are assured of a well-functioning fan. However, if you are not satisfied with these calculations, this is not the only criterion that can be used to evaluate the performance of the fan.

One of the main qualities, second only to rpm and CFM measurements, is the sound level or decibel ratio, followed by the final quality of vibration. Look for fan noise levels rated in sones or decibels. If CFM or RPM still leaves you confused about choosing a fan, check these out.

A standard air flow measurement indicates how many cubic feet of air pass through a stationary point in one minute. The higher the number, the more air is forced through the system. The volumetric flow rate of a liquid or gas is measured in cubic feet per minute in CFM and one CFM is equal to 2 liters per second.

Fan manufacturers base their measurements on a standard measurement of clean, dry air with a density of 0.075 pounds per cubic foot, a barometric pressure of 29.92 inches of mercury above sea level, and a temperature of 70°F. These standard measurements are used to determine SCFM: Standard Cubic Feet Per Minute.

By using CFM and RPM, you can make an even more informed choice and know what you’re getting when choosing your ceiling, exhaust, or table fan!

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