So with all the welding hazards talk and my new fear of isocyanide based paint (urethanes) I been thinking of making a fresh aire respirator. Kinda have a good idea me thinks. take off a line from the air compressor and feed it to a standard respirator element, then to a face mask. But will it be safe? Can a charcoal element do a good job filtering out traces of oil from the compressor? Or is there an affordable commercial product that does the same thing?