Power supply fans?

i have picked a PSU for my new pc.

I know it has enough power and things, so i dont need to know about that.

But it has two fans, one on back and one on bottom. I was wondering how the coolin is done with PSU's.

Does the fan on the back inhale air, and the one on the bottom extract the inhaled air into the case, or does the bottom fan inhale the warm air from the case, and the back fan extract it

(When i say back i dont mean the back case fan, i mean the fan on the back of the PSU)

Thanks.

I need to know this because if it gets rid of warm air then i wont need to buy an additional extractor fan.

Answers:
The bottom fan will suck the warm air from within the case, and the one at the back will blow it outwards .. u may still need an extra case fan, as the fans in the PSU will run slowly till the PSU itself is hot .. so they won't run faster when ur cpu or mobo is hot .. so its better to get a case fan.
Bottom fan take the heat from your processor, and the rear expels to atmosphere
The bottom fan on the PSU will circulate the air through the PSU out the back where the power is plugged into so the components will not overheat. So it takes the air from the inside of the computer and just blows it out the back to keep air moving throught it.

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