fans

[alakhiyar]

Too many fans can create too much turbulence and actually raise temps. There was a famous experiment with a mega-fans case that took the idea to the extreme and proved it.

However, to answer your question, generally in at the front and side, out at the rear. Think of the overall airflow path your fans will create, try and get the components that need cooling in that path (hdds, gpu, cpu, psu), and if you can see that some fans will be interfering with one another, think about making baffles with cardboard, foamcore, or plastic and tape.

[nihil]

That is why I like "exhaust fans" they suck downwards and blow outwards at the back of the case so they don't create noticeable turbulence.

[alakhiyar]

Your temps look good. If you have lots of headroom on the temps and noise is an issue, think of running some of the fans at lower voltage. You can try them at 5V, for example, and see where the temps end up and decide if you want to go back to 12V or somewhere in between. The molex connectors for the drives contain 5V already: blacks are common (-) and red is +5V, yellow is +12V.

As far as baffles, you might look at the positioning and think of an angled baffle (or a duct) to prevent the air from the side fan from shortcutting directly out the rear fans, unless the case already contains a duct from the side fan. Some do, Antec for example.

[oofki]

In general cool air is supposed to come from the lower part of the front of the case and up out the back. And usually the fan on the side of the case blows out to move as most of the hot air from the cpu as possible.

[Cider]

BEesides using a vacuum , what is the best way to clean the fan on your graphics card and inside your case.

Those compressed air cans are quite expensive, any suggestions?