I currently have a Delta Dual Bag Dust Collector (model 50-763 that is rated at 2700CFM) and am struggling in understanding what size ducts I should use to achieve the correct CFM for proper collection. Everything I have read so far seems to indicate that I should use a 6" - 8" main line from the collector out to the branch point at the device. At that point I can reduce to a 4" line to the device. My dilemma is that my Delta has four 4" intakes and as a result I don't see any way that I can use the recommended 6" - 8" main line duct. I have considered using a 6" or 8" main line up to the collector and then place a "Y" that reduces to two 4" lines that go into the collector. My question is --- would that be acceptable and achieve the same desired result. As a side note I have looked online with Delta to see if there was a way to change out the four 4" ports and replace them with a single 6" or 8" port or similar. I have attached a file with the picture of the intake area. I appreciate any and all advice.