Allied Telesis AT-SBx31CFC960 - Manual (Page 283)

SwitchBlade x3112 Chassis Switch and AT-SBx31CFC960 Card Installation Guide
283
Figure 177. 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 178.
Figure 178. Tightening the Screw on the AT-SBxFAN12 Fan Module