Canada Occupational Health and Safety Regulations (SOR/86-304)

18.24 Every employer shall ensure that air compressors and filter systems are tested annually and produce breathing mixtures that meet the requirements of clause 3.8 of CSA Standard CAN/CSA-Z275.2-92, Occupational Safety Code for Diving Operations, published in English in April 1992 and in French in February 1994, as amended from time to time.