Negative pressure?

PapaLazaru

PapaLazaru

PapaLazaru

Soldato
Joined
23 Dec 2009
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Evening chaps. I have recently moved and at the same time I rebuilt my PC and removed all the stock fans for better ones. My case is now attracting dust inside like never before. I have good dust filters (Demci Flex) and my case is a Coolermaster CM690 II. I have realised I may have a large amount of negative pressure due to me have 3x exhaust fans and only one intake fan. :o

I have made a rather splendid diagram here -

Sl0GR.png


I have a mixed batch of fans (Antec Tru Quiet 140mm at front, 120mm Noctua cooling the CPU, 2 x 120mm Fractal Design pushing our air at the top, and finally an 80mm Xilence Red Wing at the rear pushing air out.

The only othher thing I have recently changed is changing the cooler on my GPU. The old stock cooler on my 5870 pushed air out of the rear of the case but the Gelid cooler just blows it onto the card and into the case.

Now whilst my temps are ok, I need to reverse the negative pressure. I am thinking of turning round one of the 120mm fans, namely the one above the CPU fan, so it is pushing air in (and towards the CPU cooler). I would then have 1 x 140 & 1 x 120 pushing air in and 1 x 120 & 1 x 80mm pushing air out.

So do you reckon this may cure my problem or what else would you recommend?

Many thanks in advance. :)
 
Yep you have too many exhausts. It's sucking in unfiltered air through every crevice. I'd remove one of the top fans, and lower the speed on the remaining one if possible.
 
As I thought. I might remove the rear top fan and cover the hole, twist the one above the CPU cooler round so it is sucking air in and hopefully it should cure my problem.
 
I forgot it's Friday :/ I have serious business tomorrow that I've been concentrating on all week. I wish I hadn't remembered now lol.
 
desires said:
This should reduce case temps too

betterh.png
Click to expand...

Been running with this now for a week. Temps seem to have remained the same but definitely less dust on the filters and one less fan is all good.

Oh and when I cleared it out there was a massive layer of fluff on the INSIDE of the top filters! :eek:

Cheers all. :)
 
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