Yesterday I received a new 3m Versaflo M300 respirator.  For years I have been inhaling wood sanding, dust while preparing pieces of wood on my lathe and other wood projects I would make.  This is a self-contained respirator with a very good 3m filter.  I tried it on yesterday and it is terrific.  My glasses do not steam when I wear it and it should be a pleasure to wear while doing my wood projects.