A Air Flow Meter, or CFM, is a device used to measure the amount of air flowing through a system. It is commonly used in HVAC systems, air compressors, and other air-handling equipment. CFM is the acronym for cubic feet per minute, which is the unit of measure used to measure the amount of air flowing through a system. The CFM is determined by measuring the velocity of the air passing through the system, as well as the cross-sectional area of the system. The CFM is important for determining the amount of air needed to cool or heat a space, as well as the amount of air needed to maintain the desired air quality. Additionally, the CFM can be used to determine the efficiency of the system, as it can be used to compare the air flow rate of different systems. In short, the CFM is an important tool for determining the air flow rate of a system, and is essential for ensuring that the system is operating efficiently.