Agree on the mask as a must. You can also hook up a cheap extraction system by modifying a dust collector. Make sure it's free of dust before use!
The shorter the hose and less bends the better it will work.
------ Follow up post added February 17th, 2016 05:26 PM ------
Also if you're welding anything stainless or zinc coated, up your game to the appropriate cartridges. Those fumes are nasty.
Grinding stainless is also something to be careful with.
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