Hi,

I'm about to buy a dust collector that has a 4" port. I've read some
posts that suggest not using 4" ducting in the shop but to use 5" or 6"
ducting and then reduce to 4" at the dust collector and at the
machines.


What is the point of going from a 4" port on the dust collector to 6"
pipeing? Is this more efficient?

Thanks

Alex