Alan, just goes to show opinions are like____, everybody has one. I have built several of the Wood Magazine cyclones over the years. Mine doesn't have a neutral vane in it. The outlet from the blower goes to a plentium that has seven of the 6 1/4" X 65" socks on it. The are the felt ones from Onedia. Being mounted vertically, they drop the fines every time the unit cuts off. Once when I was running a moulding head in saw making some siding, I forgot to empty trash can, and had materials get into socks. About once a year, I vacuum out plentium. I really have no complaits about my cyclone, other than why didn't I build one a lot earlier. Amazing thing is I use 4" PVC (25'+) and a 10' length of flex when running my 15" planer and have no problems. Most everything I read says that it won't work, but it does.