Tyan Computer Barebone System B4881V50S4H - Manual (Page 52)

3.7 Replacing cooling fans
44 Chapter 3: Replacing pre-installed components
3. Unplug the cooling fan power supply lead from the pin
header on the mother board.
4. Remove the four screws that hold the fan to the chassis
and remove the fan.
5. Place a new fan in position in the chassis and secure in
place with four screws.
6. Plug the fan power supply into the pin header.