Oil and Gas Occupational Safety and Health Regulations
11.7 Every ventilation system used to control the concentration of an airborne hazardous substance shall be so designed, constructed and installed that
(a) where the hazardous substance is a chemical agent, the concentration of the chemical agent does not exceed the values, levels and percentages prescribed in sections 11.23 and 11.24; and
(b) where the airborne hazardous substance is not a chemical agent, the concentration of the airborne hazardous substance is not hazardous to the safety or health of employees.
- SOR/88-199, s. 19
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