I'm building a cabinet for an older JessEm master lift table. I have the JessEm fence with dust port and want to collect from underneath as well as the fence. I have seen the y fittings that collect from two locations but was wondering why I couldn't run 2-1/2" from the fence to the cabinet and then run 4" to the bottom of the cabinet. my thinking is that it doesn't matter if the 2-1/2" from the fence goes to a y fitting or a fitting on the cabinet since it's the same suction. Any thoughts?