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WebStep 3. Calculate the CFM (volumetric flow of air) at 1,200 rpm. The volume of the column of air described in Step 2 is pi (3.1416) x fan radius squared (0.5-feet squared) times the … WebChanging the speed of the fan will affect the air volume, the air pressure, the power consumed, and the acoustic noise produced by the fan. These relationships are described by what are called the "fan affinity laws". Fan Affinity Laws. The volume of air moved by the fan is proportional to the speed of the fan. CFM α RPM i.e. 3 x RPM produces ... WebEven if it's pushing less air, if it's printing properly you don't have to be concerned. Sadly, the fans aren't identifiable other than their model indication. It's a mass produced stock part, … stihl clutch removal tool