High & Low CFM Fan Placement

[Elfear]

Sorry this is probabaly a noob question but I need some fan placement advice. I have 4 high cfm fans (75 cfm) and 2 low cfm led fans (20-25 cfm) and I'm trying to figure out where to stick them. My case has two fan slots on the back, two in the front, one on the side panel, and one on the top. I know that's more than likely overkill but I figure better too much than too little. Where would you guys place the fans to get the most airflow?

 

[Tiamat]

If you want to use each and everyone ofthose fans, it may be a tough decision. Personally, in that setup, i would have the 3 low fans for exhaust, 2 medium front fans, and i might opt not to have a side fan, but rather a duct leading to the side for cool fresh air specifically going to the cpu.

Sorry if this doesnt address your question completely.

 

[hifisoftware]

I think thatt you fan setup is an overkill. I have 3 low cfm fans (2 rear and one side) and have almost same temp as if I use 6 fans with 3 additional highcfm.
In your case I would try to put one low speed at the rear and another one in the side. You migh get very good temps with just that.

Anyway if you still want to use all yor fans:
Put two high cfm at the back. Back fans by far most importan for case cooling.
Next put side fan, high cfm.
At this point you will get lowest temp and next steps are not usefull for cooling.
One low cfm fan at the top. Heat accumulates there slowly. Most of it is removed by PS.
Put in front fans.

Thi is the order tht works for my case. Try different setups yourself.

 

[Zepper]

I prefer a positive pressure case, so I seal all major extraneous air entry/exit points and I make Intake CFM >> Output CFM.
.bh.

 

[Jeff7]

Originally posted by: Zepper
I prefer a positive pressure case, so I seal all major extraneous air entry/exit points and I make Intake CFM >> Output CFM.
.bh.

If you've got more intake than output, you shouldn't need to seal anything. At least I wouldn't expect so; the pressure (as well as dust filters) should keep the majority of the dust out of the case.

 

[Zepper]

If you have a lot of open holes then the exhaust fans will be getting air from both the intake fans and the open holes. Also the intake fan's air will be going out thruough the open holes. IOW, it's very difficult (w/o excessive intake fan power and noise...) to make a Positive Pressure case unless it is pretty well sealed except for the fans' openings.
..bh.

 

[HardWarrior]

Low-speed intakes, high-speed exhausts and door fan intake.

 

[Elfear]

Thanks for the suggestions guys. I'll try a few different combinations and hopefully post some temp results here on the forum.