Which way is my PSU supposed to face?

[EverythjngBlack]

Yes, it does have a vent on the bottom.

 

[nitinvaid20]

The fan should be facing on bottom side () down side

 

[little_me]

Matter of opinion, really, following is my take on the matter:
Some cases have it at top, some have it at bottom, some cases use it as intake fan and some use it as exhaust fan.
PSU attachment is usually done by 4 screws through the back of the case (from outside)
Placement of said screws is standard enough that it dictates positioning and direction of PSU.

You can quite likely do it differently/not attach all screws and have it in different orientation than case maker has thought but... so far I have opted for "Whatever case maker thought" Usually if it is positioned on bottom and case uses it as intake fan, the case most of time also has replaceable/cleanable filter between the PSU and outside (my case has one) to keep most of the dust on the surface out from the inside.

 

[coozie7]

Turn it over, that way it won't draw cool air out of the case but from the underside.
Also, get a rectangle of nice wood to sit the system on rather than placing it on carpet ( you may have it on carpet just for the photo, I don't know ), doing so reduces dust/fibre intake, increases clearance and, actually, looks quite pleasing. 😉

 

[tsnor]

Also, can of compressed air from Staples or Amazon is $7 and will work wonders with your temps.

I'd leave it the way it is pull air from the case and sending it out the back of the PC unless you have good chassis fans. If you do do have good chasis airflow then flip it over. Agree with the comment above--- Stick something flat between the air intake and the carpet if you flip it over.

 

[USAFRet]

Personally, I prefer having the PSU draw air from outside the case, and blow out the back. Assuking of course there is a hole on the bottom, and this is not sitting on carpet.

Let the PSU do its own cooling.
Let the rest of the case and components do their own thing.