Synology NAS FS2500 Hardware Installation Manual page 22

To remove the rail kit
1 To remove the chassis from the rack, loosen and remove the screws from the rack.
2 Pull out the chassis from the rack.
3 Remove the chassis from the rack:
a Slide outwards the rear latch of the inner rail to unlock the inner rail from the outer rail assembly.
b With the help of another person, carefully remove the chassis from the rack. (You may remove all drives first
to reduce the weight of the chassis.)
22 Chapter 2: Hardware Setup