HP StorageWorks 8/40 - SAN Switch Hardware Reference Manual page 42

6. Identify the appropriate screw holes to install the inner rails to your specific device:
a. To attach the inner rails to the 8/8 or 8/24 SAN Switches, use the five screw holes marked
8. The plenum requires one screw hole marked 8 and one screw hole marked 16, as shown
in Figure 18 on page 44.
b. To attach the inner rails to the 8/40 or 8/80 SAN Switches, use the screw holes marked
16, as shown in
c. To attach the inner rails to the FCoE Converged Network Switch, or Encryption SAN Switch,
use two screw holes marked R and one screw hole marked 16.
42 Installing and configuring an 8-Gb SAN Switch
Figure 17 on page 43.