The power needed to drive a certain fan can be computed as follows:

Power(kW)=2.72×10−5QP

Power(kW)=2.72×10−5QP

where Q is the fan volume in m3/h and P is the total discharge pressure in cmH2O.

a. What is the corresponding unit of the formula constant?

b. Transform the formula to compute power in horsepower (hp), using fan volume in ft3/min and pressure in inH2O.

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