Max be 239CFM That's very close to my Big boy deltas I use to cool my radiator for my OC i7 3930k~ 4.7ghz.....
Whats the Air Pressure? My delta at 252CFM is: 1.412 IN H2O 35.877 mmH2O
What do you mean by "1.412 IN H2O 35.877 mmH2O". I'm sure you make sense. It's just that I know the lingo.