The fact that good quality does not have to be expensive is shown by the third version of the NB-BlackSilentFan series. The well-balanced properties of this bestseller make this inexpensive and high-quality series of fans the absolute bestseller throughout the world.Our least expensive series of fans moves in such high circles, however, that other producers come off worse in direct comparisons even with their considerably more expensive \"high-end\" fans. Specification:- Dimensions: 120x120x25mm- Noise Level: 21dbA- RPM: 1500rpm