How do I install fans the right way?

Aeonocean

Honorable
Oct 9, 2013
22
0
10,510
Recently I removed my fans to clean off the dust and I'm now wondering if I screwed them back on the wrong way. My computer has two side fans on the side blowing out air and I don't think that's happened before. There's a fan on the front, I can't tell if it's sucking in or blowing out air. There's two fans on the upper back part of the computer, it sucks in air because I saw paper just sticking there to see what it does. Those two fans on the back have a small radiator in between them. I'm not sure but I don't feel air coming out from the fans on either side of the radiator. I never bothered the the big fan on top of the case.

I'm not sure if I did anything right with the fans.
 

makkem

Distinguished
Hi
You need a small strip of a single ply of tissue paper,hold in front of fan and it will show you the airflow.
The standard for airflow is intake front and bottom,exhaust rear and top and the side can be either, though intake is generally better to give positive pressure in the case.