PART XXIX UNDERGROUND OPERATIONS — Brattice or vent tubes
587
(1) Where brattice or vent tubes are used to ventilate the working face, an employer shall ensure that the brattice or vent tubes are kept advanced as close as possible to the working face.
587(2)
An employer shall ensure that brattice or vent tubes used in a mine are constructed of materials that meet the requirements of CSA Standard CSA M427, "Fire-Performance and Antistatic Requirements for Ventilation Materials".
Not legal advice. Verify the cited article against the signed agreement.