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Welding and blacksmith shops almost cannot have enough ventilation. The only time there is too much ventilation is if the welding area draft is blowing off the inert gas cover or arc stailizing smoke. Smoke and welding fumes are not only unhealthy but can include toxic elements such as cadmium, chrome and manganese. Small expousures to these elements may not produce noticable reactions but can cause serious health issues later in life. In many applications OSHA requires spot ventilation. This is a good idea in the small shop as well.