I can not find the measurements for cutting the recess area on the baffle. From what I read I think you remove a radius of 240 degrees but I do not know how much to remove. Also would it help to install a wall from the input to past where the relief cut starts so as to direct all of the dust to that area? I was thinking that way you could help prevent some of the fine dust from making it back to the discharge tube. I am building a separator lid for a 55 gal barrel with a 6 inch inlet and outlet.