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AIR MOTION FORMULA for FANS














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Simple Formulae to use:
The air moving fan law formulae:

Fan delivery in cfm varies directly as to the rpm fan speed:

  • cfm2 NEW  = (rpm2 / rpm1) *X cfm1 = cfm2 Finding the New Static Pressure:
  • SP2 NEW = (rpm2 / rpm1)2 *X SP1 = SP2  -new
Required fan blower motor horsepower (hp) varies as to the cube of the rpm or cfm:
    hp2 -new = (rpm2/rpm1)3 *x hp1 = hp2 -new
















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