Thanks for the link. Great info. I just purchased two Delta 1000 CFM, three speed, remote, air cleaners for my shop to protect my lungs and customers. Small enough that I can move them around to different areas or to varnishing room when needed.

Soon will be upgrading to better dust collection for equipment to keep dust out of the air to begin with. It is also very important to seal up as best as possible all chambers in equipment so that dust is not blown out. I agree with the web site that table saw is worst culprit for this as well as disc sander in my shop so am working on building own chambers.

I also picked up two blower fans from furnaces (furnace business neighbour throws them out), to blown out dust with shop door open.

An internet search for wood + toxicity will yield numerous reason to protect yourself and your family.