Apple Xserve Intel (Late 2006) DIY Procedure for Logic Board - Manual (Page 6)

Xserve (Late 2006) Logic Board Replacement Instructions 
Airflow Duct
Loosen the five Phillips screws that fasten the airflow duct to the fan array.
Pull up on either side of the airflow duct, and lift it straight up and out of the Xserve.
Caution: Try not to completely remove the screws from the airflow duct. Tiny black rubber
washers hold these screws captive on the underside of the airflow duct. If the screws are
completely removed, these rubber washers can easily fall into the enclosure and become
lost.
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