Acer AW2000h-AW170h - Manual (Page 124)

Appendix B Rack mount configuration 108
6 Install the server into the rack.
a
Insert the inner rails into the server mounting rails, then push
the server into the rack (1) until you hear a click sound.
b Press the release latch (2) and continue to push the server (3)
into the rack until you hear a click sound