MSHA - Code of Federal Regulations - 30 CFR 57.14213
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MSHA - Title 30 CFR
30 CFR § 57.14213
Ventilation and shielding for welding.
(a) Welding operations shall be shielded when performed at locations where arc flash could be hazardous to persons.
(b) All welding operations shall be well-ventilated.