My biggest problem is that the workshop is in the quarter of the basement that has absolutely no ventilation, windows or anything similar, it's pure dead space. I am going to add a vent fan of sorts to help move some air out of the area, but I am very limited as to what I can install because of how the house is designed. The workshop area is basically completely underground except for just above the sillplate. I can put a couple 4x10 dampered side vents and a pair of high velocity room vent fans (which are basically big, bathroom fan-style fans with double squirrel cage blowers in each box) similar to the one I added in the sunroom a few years back.

I am surprised how well the air filtration setup works. The one I have is about mid-sides in the lineup of units, there are smaller and larger ones available. This one seems to be more than enough for my use.