Computer case fans work by drawing cooler air into the case from the outside, expelling warm air from inside, and moving air across a heat sink to cool a particular component. Both axial and sometimes centrifugal (blower/squirrel-cage) fans are used in computers. They are powered and controlled using 3-pin or 4-pin fan connectors. While earlier personal computers could cool most components using natural convection, many modern components require more effective active cooling. To cool these components, fans move heated air away from them and draw cooler air over them. Fans attached to components are usually used in combination with a heat sink to increase the area of heated surface in contact with the air, thereby improving the efficiency of cooling.

Case Fans

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