Paragraph 2

Without prejudice to the generality of section fifty-five of the Act the manager of every mine shall take such steps as are necessary for securing that every airway therein which as regards any working face is an intake airway and the air in which has not previously ventilated a working face shall normally be kept free from inflammable gas:

Provided that the requirements of this regulation shall not apply to any part of such an airway within three hundred feet of the first working place at that working face.

For the purposes of this regulation an airway shall be deemed not to be normally kept free from inflammable gas if the average percentage by volume of inflammable gas found in six samples of air taken by an inspector in the general body of the air in that airway at intervals of not less than fourteen days exceeds one quarter.