Fujitsu PRIMERGY RX2540 M7 Upgrade And Maintenance Manual page 424

Accessible drives
Figure 275: Removing the air grid (B)
▶ Remove the air grid.
CAUTION
Save the dummy cover (air grid) for future use.
▶
Always replace dummy modules into unused drive bays to
comply with applicable EMC regulations and satisfy cooling
requirements.
424 Upgrade and Maintenance Manual RX2540 M7