§ 207.302. Definitions.
The following words and terms, when used in this subchapter, have the following meanings, unless the context clearly indicates otherwise:
Outside airAir moving through the mined-out passageways after entering them through the main or accessory portals by mechanical or natural forces.
Pure airAir containing not less than 19.5% oxygen, not more than 0.5% carbon dioxide and no harmful quantities of other noxious or poisonous gases, dust, soot or particulates.
Safety containerA container not over 5 gallons capacity, having a spring closing lid and spout cover.
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