There is no need to calculate anything in a hobby workshop, if the impeller is around the 14/15" mark or bigger and 6" ducting used it simply works. Trust me, I have been doing this stuff for many years and have never calculated anything even in small commercial set ups. The whole idea of a bigger impeller in the Clearvue Max was to equal the airflow of the 1800 in markets that had a 50hz supply and it was never intended for the US market at all. I was the first to use a VFD on the Max to uprate it to 60hz and Bill Pentz always recommended a larger main duct to support the increased air flow. The whole idea of using a bigger impeller is to achieve the required air flow at a slower speed using 6" ducting (around 1200CFM) AT the MACHINE port and you can't do that unless the port is enlarged to 6". As I said, I have been doing this stuff commercially for over 10 years and people simply complicate it for no good reason and doing that discourages others from installing ducted systems. Read the stickies at the link below, the main contributor is a world expert on clean rooms so he knows a thing or two and certainly more than me.
For the best DE information for hobbyists on the planet go to here
https://www.woodworkforums.com/f200
For the best DE information for hobbyists on the planet go to here
https://www.woodworkforums.com/f200
