HP E840 A Series User And Service Manual page 26

Rack Mount
Adapters
26 Rack Mounting and Option Installation
2. Using the rack mount adapters as templates, position the adapters on
the rack's vertical rails where the mainframe is to be mounted. Align
the adapter holes over the "center" holes of the EIA rack units (Figure
2-2).
Note
If you are using the HP E840xA VXIplug&play Compliant adapters
(Option 925), position the adapters such that all three mounting holes are
directly over holes on the rack's vertical rails, and that the adapter flanges
cover nine full EIA rack units with no overlap.
3. Slide channel nuts over the rack holes to be used by the rack mount
adapters.
EIA Rack Unit
Center Holes
EIA Rack Unit
Center Holes
Figure 2-2. Positioning the Mainframe in the Rack.
Rack Unit
Center Hole
Chapter 2