Dell PowerEdge R905 - Manual (Page 71)

Installing System Components
71
Cooling Shroud Assembly
Removing the Cooling Shroud Assembly
NOTICE:
Do not operate the system without the cooling shroud assembly. The
cooling shroud assembly must be installed to direct the airflow from the fans.
1 Turn off the system, including any attached peripherals, and disconnect
the system from the electrical outlet.
2 Open the system. See "Opening the System" on page 67.
3 Remove the processor expansion module (PEM). See "Removing the PEM
or PEM Shell" on page 75.
4 Remove the cooling shroud assembly by lifting the shroud by the corners.
See Figure 3-5.