What he means is the flanges on the corners of the fans, where the screw holes are, are closed in, and not open like on most fans. For example, you can not mount this type of fan on a thermalright heatsink, as the fan clips need to go where that flange gets in the way.
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The Vortex H20
Coolermaster ATCS 840 w Window panel
EVGA SR-2 Classified
2 x Xeon L5639 Hexcore CPUs, 3.2GHZ
Galazy Geforce GTX 680
24GB Mushkin Blackline 1600MHZ 9-9-9-24 1.5v
Asus Xonar Essence STX
OCZ Z-Series GOLD 850W
160GB Intel 320 SSD
Sharp 32" Aquos 1080p
Benq W500 Pojector.
Watercooling:
2 x EK Supreme HF, MCR320+Gelid Silent 12 Push/Pull, DD Pump, EK Multioption 100ml Res, EK Coolstream XT 220 RAD Gelid Wings Push - CM R4s Pull.
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