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Mainly do it in a well ventilated area. The fumes are bad for your health.
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Fumes, what fumes??¿! Do you mean smoke? Or do you mean lead vapor? There's no lead vapor as long as the molten lead is not ABOVE 1200 degrees. Normal casting is done in the 7-800 degree ranges, well below the temp necessary to produce lead vapors.
Smoke can be produced while fluxing,(cleaning the molten alloy), but it's no more harmful than breathing smoke from a campfire.