Hi Wobblybootie,
I'd also seen this link a while back. They made this cylone unit after suffering alot of health problems.

Tom,
The last link product didn't get a great review, but looked promising in the picture.

In my dream w/shop I'd thought of arranging a seperate cupboard at one end (walk-in broom cupboard style), containing the induction motor type extractor with the dust collector at the bottom and filter bag at the top. This cupboard would vent through a grill to the outside via a small fan, and the cupboard door would also have a grill to give a through flow to remove the dust which escapes from the filter. The cupboard would have a 4" hole in one internal wall back into the main garage space which took the suction pipe from the cnc machine. This arrangement would make the unit very quiet, and no dust particles would enter the workshop. We can dream . . .