Whiskey Bob
New member
Hey, my first post. I am laying out the ducts in my shop and will have a main 6" PVC line running along the ceiling on two sides of the shop. At various points will be PVC drops to a blast gate at each tool. Most of the tools will be connected with 4" flex hose from the blast gate to the tool port. Should the vertical runs be 4" or 6"? I've seen photos with 6" drops that reduce to 4" near the tool, and also 6" mainline with a reducing wye that goes to 4" down to the tool. Any advice is greatly appreciated.