I am at my wits end here. I am in the middle of tearing apart all my ducts to remove a clog. How do you guys prevent this? I have tons of suction but softwoods through the joiner or planer clog up my system. I am using 4" PVC. The DC has a 4" port on it, so do all my tools. I think the grounding wire is catching some stuff and starting the clog and I don't know how to fix this. Please help.....I can't take much more if this....very counterproductive.