Just look at how a typical shop vac works....place a baffle right in the airstream,large particulates hit it then,drop out.They sink to the bttm,the fines...being much lighter,can and do,make the quick turns to get evac'd.Aerodyne makes a really nice horizontal air scrubber that takes the above to the next level.....instead of a "baffle",there's a 360* air injection that kicks the particulate out.Looks like a big arse round muffler/cat.They mount them up near the roof's of industrial buildings.Wasted space otherwise.