Thanks Bill,

However nothing like what I expected, and I'm wondering  if it would be
easier to build it out of square if the shape works so good.
Something to consider for Jerry!
I will certainly try that down the track.

George (down under)

George, The combination of shapes is what seems to work.
An all square box will have a high restriction to swirl.
The faceted cylinder can also have the exit on one or both
ends.
Bill Jepson

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