Dell PowerEdge 21DXJ Installation Manual page 32

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
rack.
4 After routing your cables through the top of the rack, close any air gap
in the cable slot by pulling the slot cover towards the back of the rack.
Use the wingnuts to secure the cover.
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Installation Guide