![]() ![]() Using the CFM specifications of a particular fan you can estimate how many times the air will be “turned over” in your application in 1 minute. The result is the volume of your application expressed in cubic feet. (Length X Width X Height) = (volume in cubic inches). ![]() Multiply the measurements in inches like this: Measure the inside volume of your application.Ģ. When you are trying to figure out how much air your fan needs to move to serve your purpose you can make an educated guess using simple math.ġ. ![]() Both of these alternate airflow expressions can be translated into CFM by the application of simple equations. (The venturi is the big hole in the center of the fan.)ĬFM is sometimes stated as “m3” (cubic meters per minute) or as “liters per second”. As a general guideline you should provide a vent hole area that is equal to approximately 1.5x the area of the fan venturi to prevent excessively high static pressure. It is important to note that CFM specifications are stated at zero static pressure because this is the point at which airflow is highest.Īs static pressure increases airflow decreases. Whether you use an air receiver tank, have a rotary screw or reciprocating air compressor, and the details of your application also impact your CFM and PSI needs.CFM (Cubic Feet per Minute) indicates the volume of air that a fan will move in one minute at 0 (zero) static pressure. However, there’s more to consider than simply matching the CFM and PSI of your tools to your air compressor. The easiest way to do this is to check the air requirements of your air tools, both CFM and PSI, and then ensure the air compressor you choose meets those requirements. Now that you understand the difference between PSI and CFM, you might be wondering how to be sure you have the right air compressor to run your air tools. What Size Air Compressor Do I Need To Run My Air Tools? When using air compressors, it’s crucial to have a sufficient CFM (volume of air) to power air tools and enough PSI (pressure) to give the air power. Even though the volume of air (CFM) remains the same throughout the tunnel, the air is being squeezed into a tighter space, resulting in the pressure (PSI) increasing.īoth the examples above share how PSI relates to CFM. As the wind blows into the tunnel, it travels through the shrinking space, and starts to feel stronger and stronger. There is a tunnel with wind blowing through it, and the tunnel gets smaller and smaller. Even though the example uses water to describe the relationship between CFM and PSI, the concept is the same with air.Ĭonsider this second real-life air example: Hopefully, this hose example is relatable. So even though the hose allows the same amount of water to escape, the extra pressure will allow the water to travel faster and further, perfect for having a water fight! Water will flow out, and it might reach a few feet past the end of the hose, perfect for filling up your bucket or watering can.īut if you take the garden hose and restrict the space at the end of the hose with your thumb to create less room for the water to flow out, the water will shoot out with much more pressure than before. Imagine you have a garden hose, and you turn it on. Let’s look at a real-life example to help understand how CFM and PSI relate: For an air tool to operate and perform optimally, both CFM and PSI must be sufficient. How Do CFM and PSI Relate?ĬFM and PSI relate to each other in an important way that ensures the proper operation of air tools. For example, an air compressor’s output rated for 30 CFM means 30 cubic feet of air is flowing per minute. In the case of an air compressor, CFM indicates how much air can move per minute. CFM measures the volume of air, in cubic feet, for each minute it moves. What Does CFM Mean?ĬFM is an acronym for Cubic Feet per Minute. *PSI is typically written in lower case letters, psi, in air compressor specs. For example, an air compressor’s output rated for 100 psi* would mean that 100 pounds of pressure is delivered per square inch. The force of the air is what gives compressed air its power. PSI measures how many pounds of pressure (force) are in an area, specifically one square inch. The initials PSI stand for Pounds per Square Inch. To better understand the difference between PSI and CFM, let’s learn what they mean. Together, they indicate the maximum air volume and pressure produced by an air compressor to power air tools. PSI and CFM are performance specifications for air compressors and air-powered machinery. PSI measures pressure, while CFM measures volume. The difference between PSI and CFM is what they measure. ![]()
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