PDQ wrote:

As to fines, the cyclone culls out almost all the big lumps (think jointer or planer) but does not do as good a job with the fine stuff as a lot of that still gets to the filters.


That's why John said "properly designed".

My JDS has had over 200 gallons of junk sucked in over the last three
months, with less than 2 gallons in the filter bag.

I use a decent amount of MDF and plywood, and own a 22" drum sander, so
I get plenty of "fine" dust. It's really obvious just by looking in the
drum how much fine dust the drum catches.