S-2.1, r. 4 - Safety Code for the construction industry

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3.20.2. Air supply: The air supplied to the hood may be natural and must comply with CAN3-Z180.1-M85 Breathable Compressed Air: Production and Distribution, and in cases where such air is not made on the premises of the job-site, it must be certified by the manufacturer as complying with the standard.
O.C. 1959-86, s. 28; O.C. 885-2001, s. 369.