I am shifting my duct work around and I am left with on awkward run to the cabinet saw lower collection.
hopefully this picture gives you an idea of layout:
IMG_2909.jpg
My choices are:
- include a direct but independent run that increase the total amount of duct work by about 7' (run c)
- connect a drop that I have right of my TS and looping it back to the cabinet (run b)
option 1 is what I have right now and I get about 500 cfm to a shop made 5" port. I don't use this port that much as my blade guard dust collection is more effective. so this port is used more for clean out or when I can't use the guard for a cut.
option 2 takes advantage of the run that goes to my jointer, bandsaw, planner and router table. (I use to drop downs and connect what ever I am using. It is obviously a super inefficient path to the table saw, but as the blast gate is before the drop down it reduces the overall ducting in the system
So to the question - does unused ducting have a major effect on performance?
If so is it worth having blast gates to block off entire branches when not in use?
FYI - I run 5" duct work with a mix of 5" and 4" ports. My DC is a true enough 2hp 11" impeller POS model made off shore that does not exist anymore. Despite its dubious origins, the performance has been good enough for my needs as I am not trying to get every micron of dust and I am happy wearing my respirator and/or working with the double garage door open or even outside.