Last week I had the Harbor Freight 2 hp dust collector follow me home. Sense then I have been pondering on what size ducting I should run for this machine. I'm leaning toward 5" I will be ordering the Winn nano filter for it today. so far it's still in the box as I want to have all the needed items rounded up first. I"m also thinking of either the Super Dust deputy or a top hat ahead of the dust collector I want to try to do this only one time not by having to try something only to have to re do it as it didn't work properly. Any input would be welcome.