Dell UPS 4200R - Manual (Page 14)

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Installation and Startup
Installing the Rails
NOTE: The instructions are the same for square-hole racks and unthreaded, round-hole racks. The rails fit both
rack styles. The square-hole rack is shown in the illustrations.
3 Select the proper holes in the rail for positioning the UPS in the desired location in the rack.
The rails should be located at the bottom of the 4U space allocated for the UPS or 3U for the
EBM.
4 Position the end of the left and right rails labeled FRONT facing inward.