Dell 3115cn Service Manual page 595

Replacement 51 FAN (PL13.5.10)
notch
When performing the step described below, take care to check the orientation of the FAN.
Replace the PLATE DUCT to the opposite side of the label surface.
1) Mate the lug of the PLATE DUCT with the notch of the FAN, and replace the PLATE DUCT
to the FAN.
2) Secure the PLATE DUCT to the FAN using the one screw (silver,tap, 32mm).
Version 1 2006.11.28
2)
Chapter 3 Removal and Replacement Procedures (RRPs)
LABEL
[NOTE]
1)
3 - 186
lug
Gnb03227KA