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Great design, perfect fan fit and easily locks together. Thanks Midevil1. Make posted.

Question (if anyone knows):
My CR-10S4 power unit has what looks like a 5.5mm x 2.1mm male power plug connector with the other cables, similar to the 12v CCTV plugs - what is this used for? It doesn't seem to be powered; I thought maybe if it was 12V I could use this to power the fans.