Dell H952N - Manual (Page 20)

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Installation
5 Attach the rails to the rack:
Engage the back end of the rail until it fully seats on the vertical rack flange and the hook latch
locks in place (see Figure 11).
Pull the rail toward the front.
Push the front end of the rail until it fully seats on the vertical rack flange and the hook latch locks
in place.
Figure 11. Installing the Rails