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## Fan Calculations – Measure Airflow with CFM

With one formula, you can find which fan is right for your home. This is the formula for a fan CFM: Cubic feet per minute, also known as CFM is calculated as follows: air speed (feet per minute) x area (square feet) = CFM. Not everyone will look into CFM, but for those who do it is a useful tool. In simpler terms than the formula, it is the amount of air moved by the fan.

The amount of air depends on other factors as well, such as the width and shape of the blades, the speed at which the blades turn (revolutions per minute or rpm), the horse power (hp) of the engine, and the overall fan design. These components establish the airflow capacity of the fan. Fan capacity is measured in terms of cubic feet, and again, this is the CFM method (cubic feet per minute).

CFM and RPM are the two most important things to look for in a fan, to ensure correct performance and efficiency. If you only know RPM, and not CFM, or vice versa, you should feel confident in your fan purchase. As long as you know one of the maths, you are guaranteed an efficient follower. However, if you are not satisfied with these statistics, this is not the only criterion you can use to evaluate the performance of the followers.

One of the main certifications, second to the rpm and CFM noise level measurement or decibel rating, followed by the next vibration certification. Check fan noise levels in sones or decibels. Check these things out if CFM or RPM still leaves you unsure about your fan choice.

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

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

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

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