Allied Telesis AT-SBx31CFC960 - Manual (Page 277)

SwitchBlade x3106 Chassis Switch and AT-SBx31CFC960 Card Installation Guide
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Figure 176. Securing the AT-SBxFAN06 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 177.
Figure 177. Tightening the Screw on the AT-SBxFAN06 Fan Module
4. Reconnect any network cables you may have disconnected to access
the fan module.