Check "Radiator Air Flow vs RPM" chart. At 1450 RPM the AP-15 moves about 25CFM through a RS120, according to it.
So 25CFM AP-14 vs 34CFM AP-15. That would mean AP-15 moves 36% more air in that test.
Correct me if im wrong (tired).
Oh and it appears there is a 2150RPM version:
http://catalog.nidec-servo.com/digit...pdf/D1225C.pdf
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