Apple Xserve (Early 2008) DIY Procedure for Enclosure - Manual (Page 109)

Xserve (Late 2006/Early 2008) Processor Heat Sink Replacement Instructions 13
Ensure the airflow duct fits flush all over, and does not protrude above the enclosure. 2.
Note: Be careful when working with any black foam pieces that are part of the airflow duct
or the logic board.
Tighten the five Phillips screws that fasten the airflow duct to the fan array, in the order 3.
shown, to prevent the duct from warping. Do not overtighten the screws.
Closing the Xserve
Replace and secure the cover. 1.
Slide the Xserve back into the rack, and tighten the front thumbscrews to secure the Xserve 2.
in the rack.
If the server case was locked, use the enclosure key to lock the security lock on the front 3.
panel.
Warning: Never turn on the server unless all of its internal and external parts are in place
and it is closed. Operating the server when it is open or missing parts can damage it or
cause injury.