Section 207.302. Definitions

The following words and terms, when used in this subchapter, have the following meanings, unless the context clearly indicates otherwise:

Outside air—Air moving through the mined-out passageways after entering them through the main or accessory portals by mechanical or natural forces.

Pure air—Air 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 container—A container not over 5 gallons capacity, having a spring closing lid and spout cover.