Division 7.1

All underground workings to which access is permitted must be ventilated in an appropriate manner.

Continuous ventilation must be provided to maintain, with an adequate safety margin:

• a healthy atmosphere,

• an atmosphere in which the risks of explosion and respirable dust are kept under control,

• an atmosphere in which working conditions are adequate while work is in progress, having regard to the working methods being used and the physical demands placed on the workers.