fan ka rpm kaise napte hai
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developers of air movement machanisms such as finance and compresses must consider the basic relationship between fan or impeller speed in RPM ( revolutions per minute) and volumetric air flow in CFM. (cubic feet per minute) while these machines have different operation principle their common characters is that each revolution of their spinning input shaft will result in a certain amount of volumetric air (or gas) flow through them when they are operation as designed according to their pitch or displacement factor
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