I think you are making a little too much out of this "fumes" thing. First off lead does not fume. The fumes you get are from impurities that you flux out of the lead. Or the impurities that you clean out of the WW before you cast. So clean your lead outside, and place a fan down wind. You will pull the smoke off the pot and away from you. Do the same when casting your bullets. Wear glasses and gloves, hard shoes or boots, a long sleeve shirt, and long pants. When you are done casting dump your clothes in the washing machine and take a shower. That will take good care of you. Tom.