Welding fume catching system are just smoke removal system, they do not effectively gather or removing the carbon monoxide and NOX fumes and heavy metal molecules released for hot glass, generated by large flame consuming oxygen and fuel.... Simply they (most welding fume hoods) do not move enough air and try to capture smoke particles with a filter.... What we are trying to get rid of are microscopic particles small enough to go through a smoke filter...
Subject is covered almost to ad nauseam here...
http://www.artglassanswers.com/forum...5c5ff3188a042e
http://www.artglassanswers.com/forum...5c5ff3188a042e
Dale
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