I moving to a new location. Currently I have a 1.75hp Powermatic dust collection system with a cyclone and large Wynn nano filter. I cobbled together 5" metal ductwork using pieces here and there from Home Depot, Lowes, etc. It works fine and has for years. When I move, I will have to start all over with all the ductwork. The metal took 5x longer than i thought it would and cost 4x as much as I expected. in an effort to have a smoother interior in my system, as I will have a larger shop and longer runs, I want to use 5" pvc thinwall drainage pipe. This is what I wanted to use years ago when I built my current system but couldn't find any locally..... Anybody in the central Calif San Jaoquin Valley know of a place to buy this stuff? I think 4" is to small and 6" too large. Randy