It seems my brain is running on low again. I have a mechanical radiator that pulls 9500cfm at 1800rpm, I know that is 4.4m^3/s. Then I have a radiator that is 0.27m^2 in size. I'm trying to reason to myself that it is 4.4m/s, but then again my brain argues to me that it is not 1m^2 area, it is smaller area, so there must be more wind. I'm sure there has to be way to solve this mathematically instead of using violence, but somehow my brain likes to disagree. Probably something very simple which I just can't see even if it is right at my nose. Can it be 1/0.27*4.4= 16.3m/s? It sounds quite a lot, I would like 4.4 much more as wiki says 5 being upper end of the scale for max fan speed.