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1.) For specified wheel dimensions, a change in speed will optimize your system:


2.) If the static pressure is acceptable, wheel length can be optimized (while other conditions remain constant):


3.) If the static pressure is not acceptable, wheel diameter must be resized using:


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Key 
Where:
N = Speed (Revolutions per minute)
CFM = Volume (Cubic Feet per minute)
HP = Horsepower
SP = Static Pressure (inches of water)
L = Wheel Length (inches)
D = Wheel Diameter (inches)
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Key
Where:
N = Speed (Revolutions per minute)
CFM = Volume (Cubic Feet per minute)
HP = Horsepower
SP = Static Pressure (inches of water)
L = Wheel Length (inches)
D = Wheel Diameter (inches)
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