Allied Telesis AT-SBx81CFC960 - Manual (Page 257)

SwitchBlade x8112 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
Section II: Installing the Chassis 257
Figure 170. Securing the AT-SBxFAN12 Fan Module on the Backplane
Connector
3. With a #2 Phillips-head screwdriver, tighten the screw at the base of
the module to secure the module to the chassis. Refer to Figure 171
on page 258.