Dell OptiPlex 990 (Early 2011) - Manual (Page 53)

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Fan Shelter
Removing the Fan Shelter
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Unthread the cables in the fan shelter clip.
4. Lift the fan shelter free from the computer.
Installing The Fan Shelter
1. Insert the fan shelter into the computer.
2. Thread the cables into the fan shelter clip.
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