PS fan... blow in our out?

[Homerboy]

I replaced my PS fan with a beefier one, but like a moron I didn't check if it was to be blowing in our out of the PS shell... let me know
thanks.

 

[beatle]

Should be blowing out.

 

[Bookie]

definitely out. If you have it blowing in then all the hot air in the power supply will end up being blown on the cpu which wouldn't be too good.