Hey I'm a noob in case mod, so I need someone to clarify things up for me. I did google around, and I found out that there are two settings that people use, so I just want to ask which fan layout is the better one

-the one I'm talking about is the blue fan (12cm fan)
-should it be sucking air in? or it should be sucking the hot air out?
-some people said it should suck in, but there is also a number of people recommend to suck the air out 



-the casing is just like this, so I hope I wont see posts like 'add more fan' or something (if really-really-really necessary, then fine)

guys,just wondering does iusing high cfm intake fan efficient or it doesnt make much/any difference if using normal cfm fan

must put filter or it will look like this



wahahahahahaha

             



Ummm it's pretty much settled for my casing, added an LED fan there so in darkness it is kind of projecting the meshed panel on the wall 

Anyway I would probably mod the top panel and add either two 8cm fan or one 12cm, based on my current setting above, will the fan(s) perform better sucking in or out?

exhaust at the back and the top...in take at the front and side panel..