Fujitsu PRIMERGY RX2450 M1 Upgrade And Maintenance Manual page 77

A second PSU of the same type as the already existing PSU can be
installed while the system is in operation.
Preliminary steps
No steps needed.
Removing the dummy cover
Figure 43: Removing the dummy cover
▶ Remove the dummy cover.
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.
RX2450 M1 Upgrade and Maintenance Manual
Power supply unit (PSU)
77