I have been researching for my own dust collection(both ambient shop air and shapeoko tailings. and found this:
https://www.oneida-air.com/static.asp?htmltemplate=static/top-notch-filtration.html
https://www.oneida-air.com/static.asp?htmltemplate=static/top-notch-filtration.html
Because I electroplate, Paint, and media blast I have more to deal with, and will add a carbon filter as well, but I found this eyeopening!
I pasted the page in and found its formatting problematic to this forum, so to get the full splendor, simply use the link!