Fan replacement help

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I am trying to install 3 Noctual NF-P12 fans. Cyberpower built my PC and I am nervous whenever I open this thing up.

Main Goal: replace the 2 fans connected to my water cooling system. I just now got the original fans off.

First question: Both fans were installed by Cyberpower in the same direction (facing inward toward radiator). Should I just do the same? I thought I've seen people say one should point in and one out (push/pull) or am I misunderstanding all that?

Second question: Have a 3rd fan to put in. Was thinking I'd do the rear fan. Is there another one that would be more important (as this fan is an upgrade to all of them)?

Problem is, my rear fan has it's power cord disappear under the Mobo, and I have no idea where that thing goes to. Am I wrong, or is there no way to really see what's happening in that area behind the mobo?

Thanks!
 
Solution
I suppose that the radiator is a long 240mmx120mm unit mounted in the top of your case? What you should do is mount the fans in the same direction blowing air out, just like the manufacturers did. The push-pull config you're talking about is sometimes done when a person mounts another pair of fans on the OTHER side of the radiator pressed against the case to "suck" air out of the back of the radiator and out through the case vent. You don't want to suck hot air from the radiator back into the case. Of course though, to mount fans on both sides of the radiator, you need a lot of space over your motherboard tray.

This is how it should look when you have only two fans "pushing" in a case...