2 vs 3 case fans to fight dust buildup inside case with positive air pressure?

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Hello,

Despite my case intake fan slots having dust filters and me vacuuming my flat fairly often I still have a problem with dust buildup so I have decided to try to fight it with having more air intake than exhaust to create and maintain a positive air pressure inside the case. My question is, should I go for 2 case fans and adjust the intake fan to always run a bit faster than the exhaust fan, or should I just get an extra intake fan?

Also, should the amount of extra RPMs in my case intake be a fixed value, or is there any reason to let it vary? This, I assume, would make the amount of positive air pressure inside the case vary somewhat also, am I correct? I would like to minimize the amount of strain put on my expensive Noctua fans that cost a whopping 22€ a pop where I live.
 
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Karadjgne
Don't worry about stressing Noctua fans, they have some of the best bearings in the industry and will more than likely last longer than the pc no matter what you do.
As to the fans, test your theory first, it's free. Adjust the fan curve to add 200-300rpm or so, or add 5%-10% duty cycle, whichever. See how that does on your dust collection. If after a month or so it still has negligable affects, then add a second fan in front, could even keep the adjusted curves. Buying a second Noctua, it'll come with 's splitter that maintain the intakes at the same speed.

As to the need for vacuuming, if you are running central heat&air, get a better grade of filter and make sure it's changed often, don't wait til the 3 months is up, because as it...
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Karadjgne

Karadjgne

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Don't worry about stressing Noctua fans, they have some of the best bearings in the industry and will more than likely last longer than the pc no matter what you do.
As to the fans, test your theory first, it's free. Adjust the fan curve to add 200-300rpm or so, or add 5%-10% duty cycle, whichever. See how that does on your dust collection. If after a month or so it still has negligable affects, then add a second fan in front, could even keep the adjusted curves. Buying a second Noctua, it'll come with 's splitter that maintain the intakes at the same speed.

As to the need for vacuuming, if you are running central heat&air, get a better grade of filter and make sure it's changed often, don't wait til the 3 months is up, because as it clogs with dust, the suction from the fan motor will pull the finer dust through the filter, which then gets dumped right back in the air near the pc, compounding your issue.
 
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