Originally Posted by
Steve Eure
Brian, check out Grizzly's website. They have dust fittings, pipe and pretty much anything to do with DC. Their plastic fittings are much cheaper than anywhere else I have looked. I haven't used much metal pipe so I can't comment on the price. If I were you, I'd go with 6" pipe. I have 4" on a 12 foot run and it does ok, but my main run that goes 18 feet is 6" and has more air flow. I am only running a 2 hp unit with a separator before the unit and I vent outside so there is no need for a filter.