Dell PowerEdge Rack Enclosure 4020S - Manual (Page 40)

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Installation Guide
Opening and Closing the Top Cable Slot
The top cable slot in the rack can be used to route cables up to a cable raceway.
1 Open the back doors.
2 Loosen the wing nuts underneath the cable slot cover. See Figure 22.
3 Slide the cable slot cover toward the front of the rack.
4 Route the cables through the top of the rack.
5 Close any air gap in the cable slot by pulling the slot cover toward the back
of the rack.
6 Secure the cover using the wing nuts.