I left for the summer and came back to this. I had a 16" main with a 12" branch. I now have a single 6" main with 3" drops.
There is a 24" planer, 6 bandsaws, 2 tablesaws, 8" jointer,2 , 3 lathes, 16" RAS, 2 drum sanders and 2 routing stations in the shop. The planer itself could use a 7" duct although it worked with the 6" it had.
School districts, gotta love them...