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Welding galv respiratory protection

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I occasionally need to weld up galv and stainless stuff, which really isn't good for the old lungs. My usual setup with a fan blowing behind me works, but I really ought to find something better. I did a little research and found a promising set of 3M products recommended here and there, but I think they're either discontinued/superceded or were for the American market. Looking for a slimline half face mask that will fit under a welding helmet with appropriate filters. Could be disposable or reusable with changeable filters. 

I found the literature pretty confusing - is it a gas, a particulate or something else that needs filtering? - so I'm none the wiser for looking!

Many thanks! 

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Stainless isn't an issue to weld. Its the Galv. I think its a gas that's given off, so you'll need an air fed mask.

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Generally you'd want to grind the zinc back to clean steel before welding anyway so it shouldn't be a big issue, welding straight onto the zinc is poor practice like welding through paint rather than grinding it clean.

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