@jalyst: first of all about positive pressure:
90%+ of the dust that gets inside a case comes from the fans. Positive pressure will bring in less dust than negative pressure and a little less than neutral pressure. But saying that positive pressure prevents dust from coming inside a case is plain wrong.Yes it does, that's that's the whole point of +ve pressure.
Higher air presser needs somewhere to escape, it escapes to where there's areas of lower air pressure.
Which is external to the case, "so long" as the air flow out of the case, isn't greater than the air flow in.
This constant need to escape prevents any airflow "into" the case*, bringing particulates with it etc.
*except for the intakes of course, derr...
You are trying to build a filter box, which is pretty common and is usually made with large fans. What I don't understand is why you'd want that filter box under your computer? This is very inefficient. These filter boxes are usually positioned near the air inlet in the room, where it is the most effective.
The problem with these is that they are ugly and you usually only see them in a work environment: you wouldn't want to have a large filter box in your bedroom or living room. And if you're trying to make it the dasa's way, it will become even uglier as it gets clogged up by dust. That's why the filter is usually located inside a box.
I misread your first post and thought this was about air filters for cases. Of course the discussion about filters for computer cases is irrelevant here, since the air is filtered before it gets to the computer. It doesn't matter if the airflow inside the filter box is low or high as long as it filters the air in the room. And since a filter box is about catching as much dust as possible, you want to create a negative pressure inside the box. I'd also recommend using foam type filters as they are very effective and catch different size particles very well. And you'll also need large fans if you care about noise.
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