Dell PowerEdge C6220 II Owner's Manual page 155

1 It is recommended to turn off the system, including any attached
peripherals, and disconnect the system from its electrical outlet.
2 Open the system. See "Opening the System" on page 151.
3 Disconnect the fan's power cable from the power distribution board 1.
Note the routing of the cable through the cable tie as you remove them
from the system. You must route these cables properly when you
replace them to prevent the cables from being pinched or crimped.
4 Directly lift the cooling-fan cage out of the chassis. See Figure 3-4.
Figure 3-4. Removing and Installing a Cooling Fan Cage
1 locking clips (2)
3 locating pin (6)
2 cooling-fan cage
4 power connector
Removing and Installing System Components | 155