Jim, I scroll in my basement workshop, it is a room that is 12'x14' but it doesn't have a door on it. As far as the dust goes, we've not noticed that it makes a difference in our home. The only cutting I do in my basement, is scroll saw cutting. I do use a random orbital sander a fair amount, when using it I have a dust collector to use. I just don't use the dust collector when scrolling, I find it makes to much noise. I do use a box fan with a furnace filter attached to it to collect dust, plus I wear a Trend air shield to protect my lungs. But, as I stated, dust is not a problem in our house. There is an air ventilation system that is always operating, that may be what helps with the dust, but I doubt it. The filter is never dirty, I check it twice a year.
Len