Ok so I'm trying to find the optimal duct size. Both for main line and branch lines. So I'm trying to wrap my head around fan curves. Below is the performance chart for my dust collector. Also I used the table on the link to determine the equivalent length for each elbow at a given diameter. Am I reading this correct. Is the sp loss per foot 0.167 at 8" , 0.221 at 7" , 0.358 at 6"? If that's the case I'm having trouble seeing any benefit in downsizing the duct at any portion even given the extra length you get at the elbows.
https://www.centralblower.com/Pdf/De...c-Pressure.pdf
https://www.centralblower.com/Pdf/De...c-Pressure.pdf
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