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Reference.org
Computer fan
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<p>A computer fan is any <a href="/facts/Fan_(machine)/DL6hHGJJ">fan</a> inside, or attached to, a <a href="/facts/Computer_case/wG3fchB2">computer case</a> used for <a href="/facts/Active_cooling/MXEHo6w9">active cooling</a>. Fans are used to draw cooler air into the case from the outside, expel warm air from inside and move air across a <a href="/facts/Heat_sink/ccIEdHnq">heat sink</a> to cool a particular component. Both <a href="/facts/Axial_fan/DL6hHGJJ">axial</a> and sometimes <a href="/facts/Centrifugal_fan/5oplEh9E">centrifugal</a> (blower/squirrel-cage) fans are used in computers. Computer fans commonly come in standard sizes, such as 92 mm, 120 mm (most common), 140 mm, and even 200–220 mm. Computer fans are powered and controlled using 3-pin or 4-pin fan <a href="/facts/Electrical_connector/rJh0cHs6">connectors</a>. </p>