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Best filtering option ever!

I don't know if it would actually make a substantial difference from the 1/4 dia. though

I found this flare from a scholarly paper that is supposed to be optimized, can't remember the source now, I think it is eliptical. I scaled it up to 6" pipe diameter. It is much larger than the...

I want to turn a BMH for 6" pipe on the lathe. I would like to cut out a template that I could use to compare the shape to.
What is the ideal BMH shape?

Steve

I am just finishing restoring the PM66 and also about 90% on building a Bill Pentz Cyclone.
I think I'll start out with 4" to the cabinet and 4" to the guard on the tablesaw. The existing air...

Bob,
Thank you for your advise, the only air inlets are the arc cutout openings that the blade raise/lower and tilt hand cranks move though.

I have a Powermatic 66 table saw with a 4" dust port. I don't want to cut up the cabinet to allow for a larger port. would adding a bellmouth to the port inside the cabinet increase performance?