I was reading recently about the idea of using 4" ducts for vertical portions of your dust system when you otherwise use 6". What if you have a significant amount of duct work between the vertical run and the machine? After my main drops straight down 3 feet to the floor, I must run another 6 to 8 feet to my table saw. Should I run that portion in 4" as well or should I go back up to 6" inch?
SteveP.