Lenovo ThinkCentre A61 Hardware Maintenance Manual page 114

4. The fan assembly is mounted with four rubber mounts that protrude through
5.
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Hardware Maintenance Manual
the front of the chassis. Remove the fan assembly by pulling the rubber mounts
back through the chassis.
Install the new front fan assembly by aligning the rubber mounts of the front
fan assembly with the holes on the chassis and push the rubber mounts
through the holes.