Lenovo ThinkStation P5 Manual page 30

9. The fan will insert into the four rubber posts in each corner. Pull on each
post to stretch it out (1) until it stretches enough that the fan base will rest
in the notch (2) at the base of each rubber post.
10. To install the Front HDD Bay Fan Kit, locate the lower notch (1) and upper
notch (2) in the front wall of the chassis near the internal SATA bays.
11. Identify the tab on the top of the fan holder (1) and the other tab on the
bottom of the fan holder (2).
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