Dell OptiPlex 745 - Manual (Page 206)

4. To replace the hard-drive fan:
a. Align its four side tabs and release tab with the five corresponding slots in the hard-drive bracket.
b. Slide the release tab beneath the metal housing covering its slot and as you slide the fan towards the rear of the computer, the other four tabs
should slide into place.
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1 hard-drive bracket
2 fan release tab
3 fan
4 side tab