It looks like Larry's idea of using furnace fans might work for this, with venting to the outside of the shop being the most healthy option. Venting outside into a catch structure removes the problem of clogged filters and the possibility of microscopic particles being put back into the shop air. In this case the dust is not from wood, it's whiting, which is finely powdered calcium carbonate used in the grouting process of stained glass. Each 20" x 40" panel is composed of lots of small pieces of stained glass, and all 400 of the panels need to be taken apart, each piece of glass cleaned, then the panel re-leaded and grouted. Whiting powder is used to clean the grout from the panel and the process is a messy business. A polisher with bristle brush, followed by a rag bonnet helps with clean up, but it stirs up the whiting powder and possibly particles of lead from the came, and that's what we want to try and minimize. Respirators are mandatory and the downdraft tables will hopefully keep most of the dust out of the air. Meeting the contract means finishing at least 2.25 panels per day for the next six months!! Going to be a lot of work for my daughter's husband and his crew. Told him I would help for a couple of months.