Tell me which side should these 3 casing fans should blow at.

[Vicboy]

Right now, I have 3 small case fan, positioned:

1 Back - Top - Motherboard, CPU, power supply are near. Wall isn't near it.
2 Front - Bottom - Hard Drive is near. Big opening it.
3 Side - Center - Wall is near it.

Recently,

1 = Out
2 = In
3 = In

The side fan is inches beside tight wall. Blowing out might not be the best option here. But blowing in doesn't seem to be a problem. This fan is near the motherboard and CPU, but not really the power supply. The front fan blows air in, since it's the one most exposed to the room and it's temperature, I think it'll be the best place. This one is literally in front of the hard drives. The back fan blows air out. It isn't near a wall and it won't start putting hot air on my leg (Since I sat next to it). Also hot air rises up, and it's nearest to the CPU and motherboard and it can blow out most of the hot air.

Though, should I blow more air in or out? What's better?

 

[sqrage]

I'd blow more out than in. Blowing more in just creates stagnant air and disrupts circulation. What I'd do is get the side fan away from the wall and leave it as intake while making the other two out. That's what I have.

The speed/power of the fans also matters.

 

[AnthraxXx]

Personally, I would do:

Front - Intake
Side - Intake
Back - Exhaust

But what sqrage said also applies. Try and get the case away from the wall.

 

[Slapshot136]

I prefer more blowing in (through meshes) so that less dust gets into the computer, but it doesn't matter too much as long as there is airflow