Dell PowerVault 210S (SCSI) - Manual (Page 18)

1-4 Dell PowerVault 200S and 210S Storage Systems Rack Installation Guide
If you have a 42-U rack cabinet, slide the latch's push-button cover up as far as it
will go, press the push button, rotate the handle clockwise until the latch
releases, and then pull the door open (see Figure 1-3).
2. Remove the front door of the rack.
If you have a 24-U rack cabinet, perform the following steps to remove the front
door (see Figure 1-4):
a. With the door open, lift out and fully retract all hinge pins.
b. Lift the door out carefully.
push-button cover
push button
handle