I think you are contradicting me just for the sake of contradicting me.
Yes, it's the 3200 rpm model. Faster models will have similar curve, as they have the same blades, same bearing, and same motor, just geared a bit faster.
And yes, other fans could push 60 CFM. But they all pretty much did it at 10 dBA louder than the Delta does. 10 dBA is a big difference man!
No matter where your rad is, next.to your ear, or next to your house. I find that most will just adjust the fan speed to a noise level acceptable to them.
So if you decide that 60 dBA is accetable for your rad hanging out the window, the Delta will produce 65 CFM while most other fans will produce around 45 CFM.
That's a big difference man!
GT's are the king of silence. And Deltas are the GT's of high speed.