A computer fan is any fan inside, or attached to, a computer case used for active cooling. Fans are used to draw cooler air into the case from the outside, expel warm air from inside and move air across a heat sink to cool a particular component. Both axial and sometimes centrifugal (blower/squirrel-cage) fans are used in computers. Computer fans commonly come in standard sizes, and are powered and controlled using 3-pin or 4-pin fan connectors.


 
    
 
    
![[Back Order] ARCTIC P12 PWM 120mm Case Fan Black/Black $7.09 + Delivery (Free with Prime & $49 Spend) @ Amazon UK via AU](https://files.ozbargain.com.au/n/87/646287.jpg?h=6403fc71)
 
    
 
    ![[Afterpay] Arctic P12 PWM PST CO - $11.80 + Shipping ($0 with eBay Plus) @ Harris Technology eBay](https://files.ozbargain.com.au/n/98/643598.jpg?h=e44ca1e1)

 
    

 
    
 
    ![[Prime] EZDIY-FAB Dual Ring 120mm RGB LED 5x Case Fans $35.43 Delivered @ EZDIY via Amazon AU](https://files.ozbargain.com.au/n/43/632543.jpg?h=e5d8cc27)



 
    

 
    



 
    ![[eBay Plus] Noctua NA-SYC1 Chromax Black 4 Pin PWM Fan Power Splitter Cables (3 Pack) for $5 Delivered @ Computer Alliance eBay](https://files.ozbargain.com.au/n/89/622489.jpg?h=714ca63a)