Another dust collector question if anyone reads this. I can't think of any reason for a 1 man shop to have different size main and branch lines. All the air should be coming from any 1 machine at one time, and you don't want to velocity to slow down half way to the DC.
I understand if it is a comercial shop that could be using 2 branches at once, you would want a bigger main line with small branches. It just doesn't make sense that I can think of for 1 person.
So am I missing something here? All the manufacturers diagrams I look at drop down in size from the main line to the branches.