Rear case fan- blowing in or out?

[JEDI]

I'm putting together a computer.

Which way should the air flow for a rear case fan?

 

[DeepBlu]

Probably out.

 

[akira34]

Out, always blow out of the rear end...

 

[EightySix Four]

that's one way to remember it

 

[BW86]

out

 

[CraigRT]

out, cold air comes in with the front fan

 

[LouPoir]

Out

 

[Navid]

Warm air is lighter than cold air. That is why warm air rises. That is why the efficient way for air flow in a computer is to enter from the low front (cool) and out from the rear top (warm).

 

[Gamingphreek]

That is also why we have a top blow hole on some cases. Heat rises "coldness" falls.

-Kevin

 

[peacemaker1ps]

Exhaust on rear
Intake on front.

 

[akira34]

Think of it this way, you don't have air going into your ass, do you?? Same with computers.

 

[MaskedAvenger]

Depends. In another thread, I noted that is you are using a ASUS PC-DL mb, its better for the rear to blow in. The cpu's are right next to the rear fan and the system runs cooler and more stable with the rear fan blowing in. Youn would need to cut a blow hole to let the air out, though.

 

[Operandi]

Originally posted by: MaskedAvenger
Depends. In another thread, I noted that is you are using a ASUS PC-DL mb, its better for the rear to blow in. The cpu's are right next to the rear fan and the system runs cooler and more stable with the rear fan blowing in. Youn would need to cut a blow hole to let the air out, though.

No it doesn?t, rear fan is exhaust only. The CPU may get a slight benefit of cooler air with an intake fan but you?re messing up the air flow within the case, cooling for the rest of the components will be seriously compromised.

 

[Tiamat]

If it is an atx form factor case, you need rear to be out.

 

[effee]

At least 1 big one, or maybe 2 blowing out

 

[L00PY]

For general usage, rear out is probably best.

That said, I get lower CPU temps with rear intakes. With no fan on my HS, having the back fans blowing in cool air lowers my temps a good 3C. Having them blowing in also directs cool air over the NB and Zalman VGA cooler. I might even be able to run the Panaflo's as 7v intakes and get better temps than if they were 12v exhausts.