Our System Fan Series comes with 20 fans in 7 different sizes (look table below). From low up to very powerful fan speed, from minimal up to maximal air flow, from medium up to extremely silent noise levels - in this series you will find a fan for every purpose. The fans are equipped with a robust slide bearing, which offers silent operation mode. They are perfectly suited for case, CPU or Northbridge cooling. For better distinction every fan belongs to one of the 4 categories Midrange, Power, Low Noise or Silent. The 3-pin connector enables fan speed monitoring by the main board.