MSHA - Code of Federal Regulations - 30 CFR 57.8525
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MSHA - Title 30 CFR
30 CFR § 57.8525
Main fan maintenance.

Main fans shall be maintained according to either the manufacturer's recommendations or a written periodic schedule adopted by the operator which shall be available at the operation on request of the Secretary or his authorized representative.

[60 FR 33719, June 29, 1995]