To determine a fan or blowers horsepower when driving a hollow cylinder/shaft use the following equation. 

Hollow Cylinder

Equation:  

        and          Open Calculator

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
R1 =	Outside Radius of cylinder, ft
R2 =	Inside Radius of cylinder, ft

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