be quiet! BL014, Fan, 5.51" (14 cm), Black be quiet! BL014. Type: Fan, Fan diameter: 5.51" (14 cm). Product color: Black http://www.testseek.com/labs/reviews/review-of-be-quiet-silent-wings-usc-case-fans/?p=1956 The great majority of PC users don’t know about the difference between high quality fans and the ones that comes with standard desktop computers. There are many manufacturers in this market but if we are talking about high quality, long lived and silen... Clearly, Be Quiet! has put some serious work in research and development before launching these fans to the market and they have done a nice work in innovating a rather stale market and product type. Everything about these fans has been thoroughly thou...