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Should a top mounted PSU fan face down?

Last response: in Components
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August 12, 2013 9:52:00 AM

I have a case with a top mount PSU, should the PSU fan be facing down or up?


Thanks!
August 12, 2013 10:00:57 AM

Fan-down gives air a more direct exit path that works with natural convection instead of against it.

So unless there are circumstantial details favoring or requiring fan-up, fan-down is an easy default recommendation.
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August 12, 2013 10:03:45 AM

A top mounted powersupply should have the fan facing down, but the air blowing up and out of the back vent.

It is the same config for bottom mounted supplies, just that it pulls from the outside of the case and immediately exhausts it.

There are a few configs where flipping a bottom mounted PSU over can be beneficial, but those are special circumstances.
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August 12, 2013 10:04:48 AM

Hi,

Normally it's downward since you want it to bring cool air in the PSU so it cools off.
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August 12, 2013 10:17:15 AM

dextermat said:
Hi,

Normally it's downward since you want it to bring cool air in the PSU so it cools off.


But his PSU is on the top

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August 12, 2013 10:27:49 AM

thomaskasper said:
dextermat said:
Hi,

Normally it's downward since you want it to bring cool air in the PSU so it cools off.

But his PSU is on the top

Air at the top of the case is going to be hot(ter) regardless of facing up or down so might as well go with the orientation with the least airflow resistance: fan-down.
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