Dell PowerEdge 4220 Guide D'installation page 31

Opening and Closing the Top Cable Slot
The top cable slot in the rack can be used for routing cables up to a cable
raceway.
1 Open the back doors.
2 Loosen the wingnuts underneath the cable slot cover (see Figure 1-16).
3 Slide the cable slot cover in the open position towards the front of the
4 After routing your cables through the top of the rack, close any air gap
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rack.
in the cable slot by pulling the slot cover towards the back of the rack.
Use the wingnuts to secure the cover.
Installation Guide
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