Hi folks. I'm designing a central dust collection system for my one-car garage shop, using the HF 2HP collector. I'm trying to decide between using one 6" main line with 4" branches, or two 4" main lines with 4" branches. My shop is set up such that all the tools that require dust collection occupy the back half of the room. Picture the tool layout forming a "U" along the perimeter of the side and rear walls. My dust collector is in the bottom left corner of the "U". I figure I can either use two 4" main lines, sending one along each side of the "U". Or I could use one 6" main line and run it up the wall and across the middle of the ceiling, sending branches out to each tool. Using two 4" main lines would make the run easier because I'd only be using the perimeter of the room, but I don't want to make a large sacrifice in dust collection efficiency. Any suggestions would be greatly appreciated!