# Air Masses Flow From What Pressure To What Pressure Fan Calculations – Measure Airflow with CFM

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## Fan Calculations – Measure Airflow with CFM

With one formula, you can figure out which fan is right for your home. The formula for fan CFM is: Cubic feet per minute, more commonly known as CFM, is calculated by the following formula: Air velocity (feet per minute) X Area (square feet) = CFM. Not everyone will take a look at CFM, but for those who do, it’s a useful tool. In simpler terms than the formula, how much air does a fan move?

The amount of air also depends on a few other factors, such as the diameter and size of the blades, the speed at which the blades rotate (per minute or rpm), the horsepower of the motor (hp), and the overall fan design. These combined factors establish the fan’s ability to move air. Fan capacity is measured in terms of cubic feet, and again, this is how CFM (cubic feet per minute) is determined.

CFM and RPM are two of the most important things to look for in a fan, so you can guarantee proper and efficient operation. If you only know RPM, not CFM, or vice versa, you should feel confident in your fan purchase. As long as you know the math, you’re guaranteed to be a well-functioning fan. However, if you are not satisfied with this calculation, this cannot be the only criterion used to evaluate the performance of the fan.

One of the main qualifications, second to the rpm and CFM measurements is the noise level or decibel rating, followed by the next qualification of vibration. Look at the fan’s noise level, rated in sones or decibels. Check if CFM or RPM still makes you uneasy about your fan choice.

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

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

With the use of CFM and RPM, you can make a more educated choice when choosing a ceiling, exhaust or table fan for your home and know what you are getting!

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