I am currently working on building my shop and have bought a used Grizzly 3 HP Cyclone Dust Collector with a 8" main connector. The main run will be over 40' and figure something like 55' or so total to the machines. It had come with some 6" Northfab piping what I am wondering is should I use 8" as main pipe instead? Either way I will be stuck buying a bunch of piping no matter what. My thought is it would be better to use 8" as the main pipe with 6" pipe used pointing down that I split into 2 4" flex to the machine. Is this the best way to approach it or is there a better way? Thanks.
-Rob