Rack Installation Guide 11
Removing the Rack Doors
See the procedures for removing doors in the documentation provided 
with your rack cabinet.
  CAUTION: Because of the size and weight of the rack cabinet doors, 
never attempt to remove or install them by yourself. 
 
CAUTION: Store the two doors where they will not injure someone if the doors 
accidently fall over.
Marking the Rack 
You must allow 10 U (44.45 cm or 17.5  inches) of vertical space for each system 
you install in the rack (see Figure 1-3). 
  NOTE: Your rack may already be marked and not require this procedure.
 
CAUTION: If you are installing more than one system, install the rail assemblies 
so that the first system is installed in the lowest available position in the rack.
1
Place a mark on the rack’s front vertical rails where you want to locate 
the bottom of the system you are installing in the rack cabinet.
The bottom of each 1-U space is at the middle of the narrowest metal 
area between holes (marked with a horizontal line on some rack cabinets, 
see Figure 1-3).