Allied Telesis AT-SBx81CFC960 - Manual (Page 258)

Chapter 12: Replacing Modules
258 Section II: Installing the Chassis
Figure 174. 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 175.
Figure 175. Tightening the Screw on the AT-SBxFAN06 Fan Module
4. Reconnect any network cables you may have disconnected to access
the fan module.