OK! Got the dust collection thing all figured out. Now I'm working on the layout of the compressed air system. I have Rapidair hose and manifolds from my previous system. For the new shop I plan to run a loop from the compressor around the perimeter of the shop with 1/2" pipe, which is sufficient for my needs (under 20cfm). The loop will be teed from which I will have drops down the walls using the rapidair system.
My question is why use black pipe for air systems rather than galvenized pipe? Is it just the cost savings of black over galvy, or is there a reason that galvy pipes and air don't mix?