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Originally Posted by Jason_The_Angry
As for CFM, i'd say in the 50-70 range.... <snip>
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Well have a look at one of these....
http://www.ebmpapst.us/allpdfs/RG125DC.PDF
Note the head vs airflow plot.
(Plots for axial fans are available from their site too for comparison. I do urge you to compare because I am doubtfull you're actually getting 50cfm from your fans.
This fan does ~52cfm at zero head which is enough to be felt standing 1-2 meters away. Feel free to prove me wrong though.)
Its bigger than 120mm (@ 180mm ) but it fits my chevette heater core decently with a small customized alu shroud. I think it pushes alot of air - more than any axial I've experienced - but it is noisier than I expected and you'd probably be better off with a large sized blower if you can afford the space.
Anyway... EBM has a boat load of datasheets available for all sorts of sized blowers and axial fans.... typically they dont come cheap though, but the datasheets should give you an idea of what kind of performance to expect out of an appropriately sized blower.