HP Netserver L Server series - Manual (Page 21)

Chapter 3 Removing and Replacing Covers
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Figure 3-6. HP NetServer LH 4r Covers
Replacing the HP NetServer LH 4r Covers
CAUTION Replace all covers before operating this NetServer, even for a
short time. Otherwise, damage to system components may
result due to improper cooling air flow.
Insert the tabs inside the rear of the cover into the slots at the rear of the chassis
and slide the cover toward the rear. Tighten the thumbscrew at the front of the
cover.
Return the NetServer into the rack. Replace the screws removed from the front
and rear.