Dell UPS 1920R - Manual (Page 21)

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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 14).
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 14. Installing the Rails