A quiet and reliable brand fan doesn't have to be expensive. We have been proving this for years with the popular BlackSilentFan series. The ideal compromise between noise and performance, along with the low price, has made the BlackSilentFan series the best-selling silent fan series on the market. Due to numerous customer requests, we are now offering the XM1/2 in the size of 40x40x10 mm. Of course, the superior NB technology is also used here.