Dell PowerEdge R930 Owner's Manual page 94

NOTE: You must install a filler bracket over an empty expansion slot to maintain Federal
Communications Commission (FCC) certification of the system. The brackets also keep dust
and dirt out of the system and aid in proper cooling and airflow inside the system.
Figure 30. Removing and installing the expansion card (half-length) from the left expansion card riser
1. expansion card (half-length)
3. expansion card riser
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2. expansion card latch