MSHA - Code of Federal Regulations - 30 CFR 57.4532
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MSHA - Title 30 CFR
30 CFR § 57.4532
Blacksmith shops.

Blacksmith shops located on the surface shall be--

(a) At least 100 feet from fan installations used for intake air and mine openings;

(b) Equipped with exhaust vents over the forge and ventilated to prevent the accumulation of the products of combustion; and

(c) Inspected for smoldering fires at the end of each shift.