IBM S822LC, Technical Overview And Introduction

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Appendix A. Server racks and energy management
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The website mentions the following key points:
򐂰 The front rack opening must be 451 mm wide ± 0.75 mm (17.75 in. ± 0.03 in.), and the
rail-mounting holes must be 465 mm ± 0.8 mm (18.3 in. ± 0.03 in.) apart on-center
(horizontal width between the vertical columns of holes on the two front-mounting flanges
and on the two rear-mounting flanges). Figure A-3 is a top view that shows the
specification dimensions.
Figure A-3 Top view of rack specification dimensions (not specific to IBM)
571mm (22.50 in.)
Drawer Rail
Mounting
Flanges
Back, No Door
494mm (19.45 in.)
Front, No Door
203mm (8.0 in.)
719mm (28.31 in.)
51mm (2.01 in.)
451mm (17.76 in.)
494mm (19.45 in.)