No. of Recommendations: 1

Is the rear facing fan a case fan or the fan within the Power Supply?

I wouldn't recommend shooting any WD-40 in there... I'd just replace it. How big is the fan? They're typically measured in Millimeters and most of the small ones are 80's or 90's. Larger sized are typically 120's or 140's.

You can find Hi Flow fans on NewEgg for $5 to $8 shipped and they take about 5 minutes to replace.

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