The Noiseblocker NB-BlackSilentFan XM1 40mmx10mm
Ultra Quiet Fan, manufactured by Noiseblocker, Germany's quietest fan
manufacturer, the BlackSilentFan series features extraordinary life spans and
near silent operation. Using the NB-Longlife advanced sleeve bearing and matched
with the NB-EKA drive, the BlackSilentFan series runs more than double the life
of normal sleeve bearings in operates so quietly you'll forget they are running.
These fans are silent performance at high value!