Speed is not a factor in moving air. You can move air with a little fan that runs real fast or you can move the same amount of air with a big fan that moves slow.
It is the pitch of the blades that moves air. Big blades with steep pitch moving slow are comparable to little blades with shallow pitch that move fast.
It seems to me someone is trying to baffel you with bull**** when they tell you CFM = watts or something similar.
The real question is, is the fan moving the air necessary to achieve the result you desire? If yes, speed is not really a factor.
Let me know if this helps you.
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