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     Air volume refers to the total volume of air exhausted or included per minute by the air-cooled radiator fan. If calculated in cubic feet, the unit is CFM; if it is calculated in cubic meters, it is CMM. The unit of air volume often used in radiator products is CFM (approximately 0.028 cubic meters per minute). A 50 x 50 x 10 mm CPU fan will typically reach 10 CFM, and a 60 x 60 x 25 mm fan will typically reach 20-30 CFM. In the case of the same heat sink material, the air volume is the most important indicator to measure the heat dissipation capacity of the air-cooled heat sink. Obviously, the larger the air volume, the higher the heat dissipation capability of the heat sink. This is because the heat capacity ratio of air is constant, and the larger air volume, that is, more air per unit time can take more heat. Of course, in the case of the same amount of wind, the heat dissipation effect is related to the way the wind flows. Air volume and wind pressure are two relative concepts. In general, to design a fan with a large amount of wind, it is necessary to sacrifice some wind pressure. If the fan can drive a lot of air flow, but the wind pressure is small, the wind will not blow to the bottom of the radiator (this is why some fans have high speed and large air volume, but it is the reason for poor heat dissipation). On the contrary, the wind pressure of the same type of cooling fan is small, and there is not enough cold air to exchange heat with the heat sink, and it can not achieve better heat dissipation. Generally, the heat sink of the aluminum fin requires the wind pressure of the fan to be large enough, and the heat sink of the copper fin requires the air volume of the fan to be large enough; the heat sink of the fin is denser than the heat sink of the fin. Fans with larger wind pressure, otherwise the air will not flow smoothly between the fins, and the heat dissipation effect will be greatly reduced. Therefore, different radiators, "RDKcooler",Our company  will recommend the manufacturer to match the appropriate air volume and wind pressure fan, but not a single fan. A fan that pursues high air volume or high wind pressure.