Positive or negative air pressure

[kenpomasta]

I was wondering if someone could help me out with which is perferable. Either Positive or negative air pressure inside a case. I just got my new case

http://www.newegg.com/app/ViewProductDesc.asp?description=11-156-133&depa=0

And Im not tyring to figure out which way the fans should be. I installed a 120mm Enermax variable fan (94 cfm) in the front, and opened up the spots where the 4 80s were suppose to be on the inside of the front of the case. Now the 120 front can blow perfectly. Now I have to figure out which direction each of the other fans need to me.. I assume the way to set it up woudl be the side fan blowing in, the Upper setup to blow out, and the 2 rear fans set to blow out, but I woudl like some other thoughts. I have 34 CFM 80 mms for each of hte other spots. With that config, I woudl have about 128 CFM in, and 100 CFM out. That woudl create a positive pressure i beleive if u understand that correctly. Anyone have any thoughts on this. I was concerned about the 2 rear fans blowing out right next to my heatsink ( SLK 800 with a Enermax 80mm variable).. Woudl these 2 fans interfere with the heatsink fan. Any input woould be helpful.

What are the advantages of using positive vs neg air pressure with like dust.. etc. Thanks

 

[133]

Positive = good
Negative = dust in cracks and crevices of case

 

[v3rt1g0]

If you want better cooling -- Negative
If you want less dust -- Positive

Very broad statements.. matters where fans are placed, etc. but you get it.