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Frank's suggestion about a high-end filtration system is great. If you can't afford it, however, you could at least benefit from an upgraded air filter. If you're using one of those cheesy things that are so thin you can see through it, it would be a big improvement to move up to the denser pleated filters.
Still, these measures will help, but not eliminate the dust problem, because anytime you move air (i.e., use fans) you're going to have a dust problem. My dust problem started when I installed fans in my enclosed entertainment center. If you can figure out a way to accomplish it, an effective way to further minimize dust with fans is to have an air-tight cabinet with a single inlet. This way you can install a filter in front of the inlet.
Another thing: You mentioned "two heavy duty fans." That sounds like way overkill. You only have to move enough air to exhaust the generated heat, not keep everything as cold as it would be if it were turned off. Moving more air than you need only brings more dust. My fans will move some serious air, but I have them regulated down to a fairly slow speed. The equipment stays warm (which is fine) but never gets hot.
Regards,
Wayne A. Pflughaupt
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