Fujitsu PRIMERGY TX2540 M1 Upgrade And Maintenance Manual page 211

Fans
Figure 135: Installing the rear fan
Ê Insert the rear fan (1) and fit the four hooks on the fan into the slots (2).
Ê Press down the rear fan until the latch on the locking lever properly engages
in the slot on the server rear (see close-up).
Ê Ensure that the rear fan is properly seated in the chassis.
Upgrade and Maintenance Manual 211
TX2540 M1