Fans and Blower Horsepower Equation

Industrial Electric Motor Application, Design
Industrial Electric Motor Supply

Fans and Blower Horsepower Equation

The following is a generic equation to determine the required horsepower to drive the fan or blower element . This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower.


P = (Q x p)/(229 x )


P = (Q x PF)/(33,000 x )


P = (Q x Pw)/(6356 x )


P = Power, hp
Q = Flow Rate, cfm
p = Pressure, lb/in2
Pf = Pressure, lb/ft2
Pw = Water Gauge, Inches
= Efficiency coefficient

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