Don't use a fan to ventilate your welding area ---- it blows the shielding gas off the weld. Remember there's not all that much flowing there.
Typical welding "ventilating" is done with "extractors" that are overhead of the weld... so that the gas has shielded the weld puddle and then leaves the area.
WE -- meaning us just doing stuff around home - don't breathe enough bad stuff to be an issue. Having said that - there ARE fumes from stuff we could/do weld that are harmful in very small doses. Stuff such as galvanized material (we don't tend to use this in our projects) - and CHLORINATED anything!
Manganese fumes are very harmful --- it's a known fact that in a study of 20,000 welders - 10% (professional welders) developed PARKINSON'S... and the suspected agent is the Manganese that is found in all steels and steel welding rod (filler) etc.
Now -- this is people welding 8 hours a day - 5 days a week - for 20 years... So WE are not really going to be affected by that... but it's still (fumes of any kind) something we should be considering regardless as far as I'm concerned.
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