Dell PowerEdge T420 Owner's Manual page 47

NOTE: Components that are hot-swappable are marked orange and touch-points on the components are marked
blue.
Figure 15. Inside the System—With Hot-Swappable Hard Drives
1. power interposer board
2. PCIe card holder (optional)
3. cooling shroud
4. internal cooling fan
5. external cooling fan (optional)
6. system feet (4)
7. heat sink for processor 2
8. expansion card slots (6)
9. heat sink for processor 1
10. hard-drive backplane
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