Now when I started welding a lot again, I notice that I breathe in the fumes a lot, I smell like smoke when I get home and my snot is black, this can not be good. Have to make some kind of exhaust system in the garage, I looked at the pro gear, too expensive for me. Have anyone made a good system cheap? Will a kitchen fan work? How powerful of a fan is needed if I hook it up to a 4" flextube, about 20 ft lenght, then out thru the wall? I probably need a pretty powerful fan to use that lenght of tube if its gonna suck up the smoke well. Does the fan work best at the front of the tube (where I weld) or at the end of the tube. In other words, whats better, to push or suck the air.