Each server is shipped with replacement filler panels for hard drives and PCI cards. A filler panel is an empty metal or plastic enclosure that does not contain any functioning system hardware or cable connectors.
The filler panels are installed at the factory and must remain in the server until you replace them with a functional component to ensure proper airflow through the sytem. If you remove a filler panel and continue to operate your system with an empty slot, the server might overheat due to improper airflow. For instructions on removing or installing a filler panel for a server component, refer to the topic in this document about servicing that component.