Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 75.302
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MSHA - Title 30 CFR
30 CFR § 75.302

Main mine fans.

Each coal mine shall be ventilated by one or more main mine fans. Booster fans shall not be installed underground to assist main mine fans except in anthracite mines. In anthracite mines, booster fans installed in the main air current or a split of the main air current may be used provided their use is approved in the ventilation plan.




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