Fujitsu PRIMERGY RX2540 M7 Upgrade And Maintenance Manual page 127

Removing the dummy cover
Figure 46: Removing the dummy cover
▶ Press in on both release latches (1) and pull out the dummy cover (2).
CAUTION
▶
Keep the dummy cover for future use.
▶
If you remove a PSU and do not immediately replace it with a new
one, a dummy cover must be installed in the bay again to comply
with applicable EMC regulations and satisfy cooling requirements.
RX2540 M7 Upgrade and Maintenance Manual
Power supply unit (PSU)
127