Acer AT350 F2 Series Service Manual page 142

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4 Install the mounting rails to the rack posts.
(1) Align the left and right mounting rails to the front rack post
mounting holes. Secure each mounting rail to the front rack post
with one screw.
(2) Align the left and right mounting rails to the rear rack post
mounting holes. Secure each mounting rail to the rear rack post
with two screws.
Appendix B Rack mount configuration