HP Z400 Maintenance And Service Manual page 124

5.
Set the airflow guide into the chassis.
a.
Place the edge of the airflow guide (1) between DIMM socket #6 and the CPU heatsink.
Figure 5-39
b.
Route the power and data cables through the opening next to the internal bay (2).
112 Chapter 5 Replacing components
Installing the airflow guide
ENWW