Case airflow direction, front to back? Bottom to top?

[smp]

I am installing two 80mm in the side (to blow on the mobo/cpu?) one in the top (to blow out, chimney?) One in the back and mabye one in the front (if I can).. what direction should all of these fans be blowing in. What I'm thinking is for the two side fans to be blowing in, on the mobo and cpu, and the rear fan and chimney to be blowing out, the front fan, if applicable to be blowing in. Does that sound okay? The power supply (300w) is blowing out.

 

[FarENheiT]

<< I am installing two 80mm in the side (to blow on the mobo/cpu?) one in the top (to blow out, chimney?) One in the back and mabye one in the front (if I can).. what direction should all of these fans be blowing in. What I'm thinking is for the two side fans to be blowing in, on the mobo and cpu, and the rear fan and chimney to be blowing out, the front fan, if applicable to be blowing in. Does that sound okay? The power supply (300w) is blowing out. >>



You need to make sure you have the same number of fans blowing in, as you do blowing out. if you put a blowhole in the top of the case, then you'll have two 80mm fans blowing out. To keep the case pressure equal, you can only have two 80mm fans blowing in. And acutally, powersupply fans arent normally &quot;high powered.&quot; So you still might have a little positive pressure. If you add more exhaust fans, put them towards the top of the case. Heat rises, so you want the heat to rise, then blow out towards the top. Put all of the intake fans near the bottom, blowing in cool air. You need to count the CFM of each fan. They should be listed on the page you purchased them from. Make sure that the intake CFM = the exhaust CFM. It doesnt do the case any good to have negative or positive pressure. Your temps might be worse off in that case...

 

[smp]

Thanks.. I don't know what the cfm rating is. Personally.. I think that brand name fans are bull. No offence. I tried (only to feel and listen) to a sunon fan, and it niether felt, nor sounded any different than a no name ball bearing fan of the same size. I baught the no name fans. I have decided not to use the 120mm fans at all. I'm only gonna use the 80 mm fans, they have a higher rpm, I care not for noise. Actually, I think it's pretty cool for a pc to be all noisy, like a real machine.. wrrrrrrrrrrrrrrrr.. yeah. Thanks.

 

[gil11542]

IMHO I like a positive pressured case it seems to keep dust out of all the cracks.

 

[DarkMajiq]

FarENheiT: While having your case pressure about equal is probably the best, there advantages to both slightly positive and slightly negative pressure, to keep dust out, or to prevent hot air from building up in the case. But a little bit either way certainly isn't going to blow your case up or anything.