Lenovo ThinkCentre M91 Hardware Maintenance Manual page 96

7. Pull and lift the system fan assembly out of the chassis.
Figure 26. Removing the system fan assembly
8. When installing your new system fan assembly, use the new rubber mounts that come with the new
system fan.
9. Install the two short rubber mounts in the new system fan assembly as shown.
10. Install the two long rubber mounts into the rear of the chassis. Push the rubber mounts through the
holes of the chassis. If necessary, pull the rubber mounts through the holes from inside the chassis.
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ThinkCentre Hardware Maintenance Manual