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Quick Airflow Question, Haf 932

Poll Results: What should I do?

 
  • 0% (0)
    Get the same fan, and continue with the slightly negative flow
  • 25% (1)
    Get several smaller fans to pull more air, and increase the negative flow
  • 50% (2)
    Get a weaker 230mm or a single smaller fan to try to get back to even/positive
  • 25% (1)
    Leave no fan on the top and let the top flow out naturally through the grate.
4 Total Votes  
post #1 of 9
Thread Starter 
Setup: Stock Haf932 with fan filters on the front/side intake, H50 push/pull exhaust in place of the back fan. 570GTX exhaust blower. Looks like this:



Pretty much had a negative flow going (i think, based on all the pet hair being sucked to non-fan grates) because of the fan filters on the intakes.

Today I was doing a quick vacuum out and left the computer running. I hit the top fan(230mm), and snapped a blade. So now I'm without that top intake.

I can easily pick up an identical replacement from the CM store, but should I? I know that several smaller fans would be a better performing... but that would just increase my negative flow (bad). What do you think? Same fan? More fans? Less? None?
Edited by Celeras - 4/24/11 at 9:13pm
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post #2 of 9
Hot air rises, so you don't want to have a top intake fan anyways. I would just keep the side intake and front intake, and leave the h50 exaust and gpu exaust the way they are. You could of coarse make the top one an intake, but you'd really just be blowing back any hot air into the case, that hadn't been picked up by the exasut fans.
    
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post #3 of 9
Where can you put filters on your fans? That's where your intake fans should be.

The fewer fans the better: less noise. So have no top fan. You don't need it.

I don't like negative pressure cases: they are vacuum cleaners without bags, so the dust settles on electronics. You can't filter the incoming air because it goes in through every crack. Best is a flow-through case, one that is just positive enough to move air.
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post #4 of 9
Thread Starter 
One vote? ;;

bump
Ivypascal
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post #5 of 9
I looked again at your drawing. You have an H50 sending air out of the case. IMO you should either have the H50 pulling outside air into the case or have your top 230mm pulling air into the case.

Hot air rises, unless you push it somewhere else. When you let hot air rise it goes into your rad and dcompromises its cooling. Provide fresh air to your rad, either pulled directly from outside or pulled from above the case.
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post #6 of 9
Thread Starter 
Quote:
Originally Posted by ehume View Post
I looked again at your drawing. You have an H50 sending air out of the case. IMO you should either have the H50 pulling outside air into the case or have your top 230mm pulling air into the case.

Hot air rises, unless you push it somewhere else. When you let hot air rise it goes into your rad and dcompromises its cooling. Provide fresh air to your rad, either pulled directly from outside or pulled from above the case.
Pulling air in from the top would be stupid, as would using my H50 as an intake since my GPU exhausts heat out the back right below it.
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post #7 of 9
Your GPU, while exhausting its hot air out, is still heating up the inside of your case. Test your H50 as both intake and exhaust and see how your temps go.

I'd never advise the top as intake, unless it was for a WC radiator.
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post #8 of 9
you should be able to throw a 120 in the bottom next to the psu, that would create positive pressure AND bring in the coldest air, but dust will be a problem if you don't keep you're environment clean.

I only suggest this because I do this myself.

My side panel fan has been replaced with 4 120's as well.
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by InvalidUserID View Post
Your GPU, while exhausting its hot air out, is still heating up the inside of your case. Test your H50 as both intake and exhaust and see how your temps go.

I'd never advise the top as intake, unless it was for a WC radiator.
I did when I first got it, exhaust produced better for me

Quote:
Originally Posted by That Guy View Post
you should be able to throw a 120 in the bottom next to the psu, that would create positive pressure AND bring in the coldest air, but dust will be a problem if you don't keep you're environment clean.
Probably a good suggestion normally, but my tower is on hardwood and my PSU already sucks from the bottom. You should see how much pet hair is stuck to the bottom of that grate, even with my obsessive cleanings. Not the best idea for me
Ivypascal
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Ivypascal
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