Problem is, when you're using 25% argon/75% CO2, you're also releasing 3 times as much CO2 as you are argon. In a confined space, that CO2 will displace the available oxygen...THAT's where the need for ventilation comes into play, because it's the CO2 removed from the bloodstream via the lungs that the body expels, and the body seeks to replace that with oxygen-rich air....which it can't get in a CO2-rich atmosphere.
I'm not a doctor, and I don't play one on TV...but I have welded with Ar/CO2 mix.
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