I find if I use a very cource sand paper for shaping things, the dust isn't very fine, but large and heavy, falls straight on the floor. Then use the finer paper at the very end, just to finish things up. Its just one peice of the puzzle . It might take a combination of things to control dust. I have one AC return just outside the shop door and it tends to trap a good deal of dust also. I like the fan idea. But I try to keep the airflow in the room to a minimum to let the dust settle locally. I will go to the garage for sanding big areas or for using the electric palm sander. Houston ain't that cold. Although it feels it sometimes.