Intel SC450NX - Server Platform - 0 MB RAM Product Manual page 104

NOTE
The two installed fans nearest the 5.25-inch drive bays (fans 6 and 7 in
Figure 34) are separated by a square piece of foam (the piece with a
crescent-shaped hole) that extends perpendicularly from the front of the fans
(in Figure 34, it is the rectangle between the round faces of fans 6 and 7).
You must remove this piece to access the two fans it separates (pull it
straight out).
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Figure 34. Fan Cabling
OM08021a