Code of Federal Regulations · Section

§ 57.22217 — Seals And Stoppings (i-a, I-b, And I-c Mines)

30 C.F.R. § 57.22217

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All seals, and those stoppings that separate main intake from main return airways, shall be of substantial construction and constructed of noncombustible materials, except that stoppings constructed of brattice materials may be used in face areas.

30 C.F.R. § 57.22216 30 C.F.R. § 57.22218

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