Originally Posted by
Jim Becker
"Generally speaking", no. In the common PVC/ABS pipe types that are used by folks for the "alternative use" of dust collection, it's pretty much even numbers. I think that PVC electrical conduit may come in 5" based on my memory of someone mentioning that, but that's pretty heavy stuff, not like the S&D pipe that's preferred by people wanting to use plastic for their DC duct work.
You can get pretty much any size in 1" increments from 3" up in metal duct, however, whether it's snap-lock, spiral or quick-clamp.