In my shop I have a 14" bandsaw, lathe, drill press and several small benchtop machines. I just bought the 2HP Harbor Freight dust collector. It's time to get things piped in. I have to determing PVC or metal. I have read that it is best to use 6" ducting. WOW this seems huge! I suppose it is all about air flow but has anyone actually used just 4" ducting? That seems plenty to me. My bandsaw dust is pretty fine. I cant imaging it clogging up a 4" duct. Now my lathe would produce some large curlies but I would think 4" would still be big enough???? My smaller benchtop machines will also be very fine "dust" and easy to pick up. So for MY use would 4" be ok to use?
I'm also going to need a few blast gates. I think I will probably make them my self. I will have to look around and find a good plan for them. I think I remember Stu making some. I do understand to use (2) 45 degree curves instead of a 90.