Doing grinding and sanding of plaster etc. - on a table next to the wall in a garage.
Took an old window AC unit and removed the coil and everything except the fan that sucks air in from the end - opposite end has the motor. The fan has a square exhaust slot on top. Connected this to a trash plastic bag with a bungi cord. The other end is fastened to a 5 gal paint can (remove bottom) also with a bungi cord - through the wall with a piece of screen nailed flat on the stucco - to keep rodents out. No need for a hood if you slant the bucket toward the exterior for drainage.
The result is a reasonable quiet - two speed - exhaust fan that does an adequate job of removing any dust within about three feet of the 6" dia fan opening - which I extend with a short piece of duct.
mike