Dell PowerVault 51F (8P Fibre Channel Switch) - Manual (Page 18)

4 Dell PowerVault 56F 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 3).
push button
push-button
cover
handle
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