Thank you for the replies. I must admit I was trying to take the easy way out. Perhaps going with a 5 or 6" initial run that would pick up the table saw, jointer and portable planer and then reducing to 4" for the overhead run of 15' plus drop to the bandsaw, would serve me better. That would connect my most used tools. Adding the Wynn filter is definite. Still debating the Thien vs. Super Dust Deputy.