a great product, I ordered two to renew two former fan coolermaster already well known, and this is the real surprise impressive breath, these two have almost higher fan speed to my 220mm fan! 230 cfm to the MAX! Really overkill, only one big downside is specified as such necessarily a power has a price, the noise! A substance that produces a very unpleasant noise yet I configue noisy but it covers everything! So coupled has a good Rheobus, they are unobtrusive to 70% (which is rarely happens for me) In conclusion this is a very good fan I recommend