Dell UPS 1920R - Manual (Page 22)

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Installation
6 Slide the cabinet into the rack (see Figure 15). Repeat for any additional cabinets.
Figure 15. Installing the Cabinet
7 Secure the front of the cabinet to the rack using the four thumbscrews on the mounting brackets
(see Figure 16). Tighten by hand; do not use power tools. Repeat for any additional cabinets.
Figure 16. Securing the Cabinet