" Look at it this way. If an electric fan pulls X CFM, that flow would also be equal to the flow at X MPH. Once you exceed that X MPH, the constant speed fan is useless. Now the flow needed has to be greater than the restriction of the fan body and the shroud. "

If you are assuming the the electric fan does not have forward facing into the airstream intake, because if it does, the cfm will be higher then the cfm at standstill.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.