Axial fans are standard case fans. High flow, extremely low pressure, and totally incapable of pulling a meaningful vacuum or pushing against any kind of backpressure.
"squirrel cage" fans are the kind that that coolermaster aero heatsink uses. They flow less air than axial fans do, but at much much higher pressures, they are not nearly as easily perturbed by backpressure or vacuum as axial fans are.
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Resident Dual CPU Addict: 3 working duallies, 2 more in the parts drawer, and looking to add an Opteron dually to that list as soon as I can find a good motherboard...
Axial Fans
