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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.

Equation:

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

or

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

or

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

Where:

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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