EKL 140x140x25mm Wing Boost 2300-1200 U / min 19.6 dB (A) Black / Red, 84,000,000,108 (Personal Computers)
I run two of these fans at the front air intake of my PC case, where they replaced a "standard fan" of Corsair. Under full load, although they are already audible, but by the PWM function, this should probably occur only rarely in practice. The
