I wouldn't concentrate too much on the volume of air that you need to move. I would recommend trying a computer fan that you can get at Radio Shack for around $20. Install it and see if your temperatures stabalize throughout the incubator. If you then feel that you need more air add another fan. The whole purpose of the fans are to circulate the air to help maintain a more costant temp from top to bottom, side to side. Sometimes experimenting is better than formulas. For example, on paper you may need to move 50 cubic feet of air a minute, but in fact you may be moving too much air and you really only needed 25 cfm. Hope this helps.
Wil Combs
Captive Bred Creations

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