Dell H967N - Manual (Page 20)

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Installation
5 Attach the rails to the rack (see Figure 11):
Adjust the rail so that the flanges fit outside the C-shaped vertical rail.
Secure the rail using the supplied #12-24 Phillips head screws (four for each rail). Use the bottom
two holes for the front of the rail. Use the second and fourth holes for the back of the rail.
NOTE: If the vertical rail has square holes, use a square nut (not supplied) with the supplied #12-24
Phillips-head screw.
Figure 11. Attaching the Rails to the Rack