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michael, Positive pressure ventilation is used to keep radon out of basements and other underground living spaces. And it's amazing how little a fan is needed to keep the radon levels down near zero...probably would work on airborne dust too(?). If it were me, I would start with a whisper-quiet computer power supply fan. For it to work (ie: have positive pressure), the room must be pretty tightly sealed and a small opening (with small fan blowing in) steadily maintaining the pressure in the room slightly above the rest of the building. I change my furnace filters once a month religiously and that makes a huge difference in the amount of dust that lands on my gear. When I forget for even a couple of weeks, I can really tell the difference. And dust is attracted to electronic equipment like nothing else. Bill "Hawkeye"