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Intake Vs. Exhaust Fans Ratio

post #1 of 20
Thread Starter 
Alright. So I have the CM 690 II Advanced. This case has holes and freaking mesh everywhere. Like, I can straight see through the front panel in the empty bays.

Currently, I have 1 Zalman 120mm SF3 in the front as an intake.

I have 2 Zalman 120mm SF3's on the top as exhaust, and 1 in the back as an exhaust.

On the Venomous-X I'm installing, its push pull with the air going towards the back exhaust fan. Standard style.
Quote:
Too much negative pressure can prevent some components from getting any air flow at all.

I was curious. What is the ideal ratio of exhaust to intake fans? Is it bad that I have it so unbalanced? Any thoughts?
Edited by nyates - 7/21/11 at 6:42am
    
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post #2 of 20
You just have a negative pressure set up, which has the con of sucking in a lot of dust. Most people prefer a positive pressure set up. I don't run any exhaust fans on my HAF-X and have pretty darn good temp. Running 2x 166cfm NZXT 200mm and 2x 88cfm Scythe 120mm.
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post #3 of 20
you are going to have dust problems eventually.

I would first consider adding an additional front intake fan... for starters
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post #4 of 20
it depends, but its better to be equal or positive pressure

but as long as your pc or anything isn't over heating or having problems due to heat you should be fine tho
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post #5 of 20
Thread Starter 
Would removing one of the top exhaust fans be as advantageous as adding another intake? Or would the additional intake be more beneficial. And yeah, this thing does have a bit of a dust accumulation problem.

Don't get me wrong, my house is clean. Seriously clean. But I've had to clean out the dust filters twice in about 6 months? And I'm kinda picky? That's not too bad, but it does keep the front of the case from looking as black as it should.
    
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post #6 of 20
I would not consider it a blanket statement that positive pressure is preferable. In many cases, especially w/ SLI/CF setups, Positive pressure can lead to dead spots in terms of air movement and cause a rise in temps, especially on the GPUS.

Exhausting hot air is a priority imo if you cant have a perfectly balanced set up, but you will have more dust if you dont have filters on your intake fan(s).

Assuming you have a fan controller, or something to change speeds, I would probably run the top fans a bit slower as heat naturally rises, just find a speed that lets you feel a little bit of air, but makes little/no noise, and then crank the rear exhaust fan up to something bearable, then match your intake to that same speed.
    
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post #7 of 20
i have 2 x 200mm intake fans and 2 x 120mm exhaust fans.
its entirely up to you how you do it, but you want air to move through your case to keep temps down,
have a look at Ehume's diagram. wink.gif
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post #8 of 20
Thread Starter 
Alright. Sweet. Thanks for the help everyone. Appreciate it!
    
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post #9 of 20
dont take out the top fans, add more fans lol
   
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post #10 of 20
hot air rises :-)
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