Welding fumes are a complex mixture of very small particles (fume) and gases. They are created when metals are heated and melted during welding. The type of welding, the materials being welded, the amount of heat used, and other factors all contribute to the composition of the welding fumes.
There is no definitive answer to how many CFM are needed for a welding fume extractor as it will depend on a number of factors such as:
-The type of welding being carried out
-The materials being welded
-The amount of heat used
-The size of the area being welded
-And others