2700 CFM is a heaty fan...keep in mind, I only have 15" of cool-able vertical surface on the radiator.

The ratings on the fans I've looked at (Flexalite, CSR, Derale) are all at 0º Static Pressure...so you're right.

I read that many radiator manufacturers recommend that 70% of the radiator surface needs to be covered by a fan.

If I have a surface that is 367.5"squared, and a 16" fan only takes up 201" of that surface(pi*r^2)thats just over 54% of the radiator being covered.
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I may have an easier way to figure this out, but I never got this far in mech. engineering class...

Does anyone know how to find an estimated CFM rating by the pitch of a fan blade, amperage and fan diameter? I could always try to find the CFM of my stock fans and work off that...