8.2.3 Installing a system fan 
Figure 65: Installing a system fan module
Ê Insert the system fan as shown.
Ê Press down on the system fan until it locks.
8.2.4 Concluding steps
Ê "Reassembling" on page 61
I When a system fan module fails, the remaining fans will start operating 
at full speed. After the defective fan module has been replaced, all fans 
will continue to run at full speed for a couple of minutes, before resetting 
to a lower speed.
Ensure that all system fans reset to a normal operating speed.
Ê "Performing a fan test after replacing a defective fan" on page 98