# How do you test CFM for a fan?

## How do you test CFM for a fan?

Exhaust fan test. Armed with the fan operating static pressure and the fan speed, go to the manufacturer’s fan table matching the fan being measured and plot fan airflow. Draw a line intersecting the fan speed and the fan operating static pressure to reveal the fan operating CFM.

How do you calculate cfm from RPM for fans?

Define the terms in the general centrifugal fan formula and rearrange them to use the formula to solve for the higher air flow: CFM 1/CFM 2 = RPM 1/RPM 2 x (D1/D2)^3 (cubed). The (D1/D2)^3 is 1, since the impeller diameter stays the same, so CFM 2 = CFM 1 x (RPM 2/RPM 1).

How do you calculate CFM for exhaust fan?

To calculate the minimum cubic feet per minute rating needed for an exhaust fan, multiply the bathroom’s length, width and height, and then multiply that result by 0.13. The final answer is the minimum CFM rating for the fan.

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### How to calculate CFM for a paint booth exhaust fan?

How do you calculate CFM for a paint booth? Measure the length and width of the booth’s face. This is the opening in the back of the booth from where the air will be expelled. Multiply the length and width together to get the booth’s face area. Multiply the booth’s face area by 100 feet per minute to achieve CFM.

How much CFM do I need for a ceiling fan?

If you have a regular sized bedroom of 144 to 225 square feet, then a medium ceiling fan with a blade span of 44 to 50 inches will be a great fit. You will want to check your fan to ensure that its CFM rating is anywhere between 1,600 and 4,500. The higher the CFM rating on your fan, the more air you fan will move.

How to calculate the air flow of the fan?

Now that you know the fan area it is time to multiply it by the air speed of the fan . This will give you the air flow in CFM (or cubic feet per minute). Determine the horsepower. In order to find the horsepower, multiply the air flow by the total pressure and divide the result by 6356.