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To determine a fan or blowers horsepower use the following equation.

Equation:

and

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Where:

T =	Required Torque, lb-ft
WK2 =	Inertia of load to be accelerated  lb-ft2 (See moment of inertia calculations)
=	Change of speed, rpm
t =	Time to accelerate the load, seconds
W =	Weight of object, lb
R =	Radius of cylinder, ft

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