Review on ARCTIC BioniX F140 - 140mm Gaming Case Fan with PST Technology, Ultra-Quiet Motor, Computer, Fan Speed: 200–1800 RPM - Grey by Jon Lesperance

Great product! If you are looking for a great silent 140mm static fan, look no further! Also, the best part is that it has rubber inserts for the propellers that create and reduce vibration noise when running at full speed. Compared to my previous 140mm NZXT AER140mm RGB fan. I'm more than happy to sacrifice RGB for silence. That's the only reason I stick with ARCTIC products. At about 50% RPM and below it makes whirring noises. I really like this fan but when I'm surfing and hanging out I don't want to hear that sound. So I return. But if you plan to use a wind tunnel then this is a GREAT product.