Dell PowerEdge T300 Series Hardware Owner's Manual page 94

NOTE:
Filler brackets must be installed over empty expansion card slots to
maintain Federal Communications Commission (FCC) certification of the system and
protect against electromagnetic interference. The brackets also keep dust and dirt
out of the system and aid in proper cooling and airflow inside the system.
Figure 3-20. Removing and Installing an Expansion Card
1 expansion card latch
3 expansion card guide slot
5 expansion card
94
Installing System Components
5
4
2 expansion card tab
4 expansion card connector
2
3
1