StacksVerified U.S. regulatory reference

30 CFR §75.343

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Underground shops shall be equipped with an automatic fire suppression system meeting the requirements of § 75.1107-3 through § 75.1107-16, or be enclosed in a noncombustible structure or area.
  2. (b)Underground shops shall be ventilated with intake air that is coursed directly into a return air course.