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post #11 of 14
Thread Starter 
Quote:
Originally Posted by spacegoast View Post
Fan filters FTW .....but you are correct. there is more dust with negative pressure.
Hmmm fan filters............. This is gonna be difficult with my Lian-li V1000 as the case is full of holes , especially at the front. I've been looking for some of that filter media in large sheets, you know the stuff they use for fan filters, to see if I can reduce the amount of dust in the case. This is a great case but dust is the biggest disadvantage.
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Blue Dragon
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post #12 of 14
Thread Starter 
Quote:
Originally Posted by Manyak View Post
It depends on your case, but positive pressure = more "contact" between the air and the fins of your cpu cooler and therefore better heat transfer. If you can create a positive pressure inside your case while still providing good air exchange you will get better results than with that same airflow at a negative pressure.

The problem is that, like others are saying, its much easier to get that high level of air exchange with negative pressure which is why it often yields better results.
So basically what you're saying is adjust exhaust and input fans for a very slight positive pressure, how would I test if I have a positive pressure?

Once I've added the two fans to the top of my case my first test will be to use these as input to blow fresh air on to my graphics card, the front fan will also be input but set at low speed to keep the HDD's cool and the rear fan at high speed to exhaust as this is nearest the CPU fan.

Hmmm.... .... I think that should work.
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Blue Dragon
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post #13 of 14
Quote:
Originally Posted by Manyak View Post
It depends on your case, but positive pressure = more "contact" between the air and the fins of your cpu cooler and therefore better heat transfer. If you can create a positive pressure inside your case while still providing good air exchange you will get better results than with that same airflow at a negative pressure.

The problem is that, like others are saying, its much easier to get that high level of air exchange with negative pressure which is why it often yields better results.

Positive pressure can lead to dead spots though. When you have all this air coming in to the case and not enough to push it out it kind of just sits there. that is why having a negative air pressure encourages air flow. With more air being pushed out it kind of creates a vacuum for more air to be pulled in to fill in for the air that is pushed out. its hard to explain.
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MIVE
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post #14 of 14


All things being equal, a balanced (pressure) and unidirectional airflow will serve you well.

The dust issue is inescapable. I have a tendency to go filter-less as I clean out my cases on a weekly basis. Imho the filters simply impede airflow between these cleanings that are frequent enough to nullify the issue (for me).

A positive air-pressure indicates that there may be turbulence in the case (ciculation while awaiting exhaust). Is this an issue? When it comes to a 1C difference, I tend to ignore it. If the dust-thing is an issue for you, try to balance it out.

Most retail cases have an intake at the bottom-front of the case, and an exhaust on the mid-to-top of the backside. If you can mod the case so that there are 2 distinct straight and parallel airflow patterns (i.e. one on the bottom and one on the top, both front to back) then you will be one step ahead of the airflow game.

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Flux
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