I am looking to upgrade my dust collector to a 3 hp cyclone type. As others have commented, there are a lot of different options. I also found that there is a lack of believable data that the mfg post on their machines.
I plan on running 6" duct to my larger machines and close to the machines reduce down to the 4" machine ports. Also, I have some equipment that has 2.5" ports.
I was impressed with the information on the Oneida Smart Dust Collectors. They run on a 3 phase motor with a VFD. This allows a variable speed dust collector. As the air flow decreases when using a smaller port, the motor compensates and the static pressure goes up giving greater vacuum. It sounds like a pretty good design but not cheap.
Does anyone have one of these Smart Dust Collectors and how has it worked for you?