Question about my case and its fans... Which should be intake and which should be exhausting hot air?

[Lt Mashumaro]

My current set up is listed in my signature.
Currently I've got all of my fans set up in this fashion:

The only question I have is, which way should the side panel fan be blowing? My PSU blows air upward, and my GPU's fans blow down, and currently the side panel fan is sucking in cooler air. I feel like I should make it exhaust the air from the PSU and the GPU because I feel like it's just recirculating the hot air back onto my components, making them hotter. Then again I'm unsure, and that's the sole reason I came to this forum...

 

[romirez]

If temperature at your PC case is #1 at your setup -You may use turbine gpu cooling system.

 

[Lt Mashumaro]

@romirez Care to explain what you mean?

 

[romirez]

Turbine cooling system will blow hot air out of the case, but abit more noisy.