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Designing a pressure fan (for air) from scratch

Designing a pressure fan (for air) from scratch

Designing a pressure fan (for air) from scratch

(OP)
I am taksed with designing a radial pressure fan from scratch.  I am familiar with the fan laws, however they really only help when there is already a known fan with its own known empirical data to begin with...  

Let's say I have to move 100 SCFM of 70 degree F air at a 25 inch of water pressure drop.  How would I even begin?  I need an inlet diameter, a wheel thickness, a wheel outside diameter, as well as a housing diameter.  Are there any links to sites showing how this is to be calculated?  Thanks for any help!

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