I am getting mixed suggestions from several people as to what size duct work to run. I just bought a 2 hp shop fox and it has, at its origin, a 6 inch. Supplied me with a split 4 inch. I have one long wall with the drill press about 30 feet from the collector to the left. In between the drill press and the collector is the radial , the mitre saw, the sander and bandsaw right next to each other. I plan on putting a shaper about 8 feet from the collector @ 90 degrees from that row of tools. can I run all 4 inch. I seldom run more than one tool at a time. I want a floor sweep also. I have a planer on wheels I was going to just move to the shaper location when I need to.Some people are telling me run a 6 inch trunk and branch off with 4″. Some are saying stay all 6″ all the way to the machines. Some are saying dont use PVC you will explode.( I probably will use pvc). Any help will be appreciated.