To the fan itself:
It is especially recommended for use on radiators for water cooling very, because it has a high "static pressure".
Does that mean he sucked air more "press" can be used as other fans who are trying as much air as quickly as possible to blow out of the PC case also.
Such fan could not blow the air through a fine-mesh radiator, the air would speak bounce off the fins of the radiator and the more hot air would be blown into the case as purely comes out.
I myself have now fixed 4 of this fan on my Corsair H100 radiator.
The cooling power is enormous after 2 hours gamble of Battlefield 3 is my AMD FX 8120 processor just at 40 ° C and in normal operation of Windows 7 cool the processor fan 4 to 26 ° C down. All this at the lowest level of the fan control my water cooling and below said adapter.
In addition, an adapter for each fan while the voltage from 12V to 9V ('m not quite sure) down regulates whereby the fan runs slower and quieter.
I just can not fault the fans say that's why I give full 5 stars.
Strong buy recommendation for people with water cooling.