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Hi cb, How we keep dust from entering a commerical buildings, ie; office building, hospital, etc; is to positive air pressure the indoor area along with a air tight building wrapper to keep dust out. The static positive air pressure keeps the dust from blowing indoors when a door/window is opened. As you can see this requires alot of CFM of make-up air from a fan. We then deaccellerate the air dropping the larger dirt particles before our prefilters then push the air thru the final filters before discharging into occupied space. This would be on a simple HVAC design. We then, depending on the building HVAC requirements, treat the air by heating/cooling and/or with electronic dust collectors, ultrasonic dust control, UV dust control, etc; A home would also require the same treatment to resolve the same problems. The electronic air filters will help some what with dust but they help more with pollen control than dust but Marginally at best. I laugh every time I see infocommericals claiming a 200cfm unit cleans the air to where it would help the average person. Until you positive pressure a building, your pretty well trying to push a rope. Also when the fan quits on a positive pressure building, you will feel like you can't breath. T_Bone
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