IBM eServer 240 xSeries User Reference Manual page 98

Completing the rack model installation
To complete the installation for the rack model:
1. Install the top cover, if it was removed.
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IBM xSeries User's Reference
1
Top cover
2
Side latches
3
Flanges
a. Align the top cover 1 with the top of the server, about 25 mm (1 inch) from
the front of the server; the flanges on the left and right sides of the cover
should be on the outside of the server chassis.
b. Hold the cover against the server and slide the cover toward the front of
the server until the cover clicks into place.