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

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3.2.15. Shower features: The showers referred to in section 3.2.14 must be installed separately for each sex, not less than 1 shower per 10 workers or fewer of each sex, in rooms that are maintained at a minimum temperature of 20 °C and that have a minimum level of illumination of 250 lux. They must be supplied with temperature controlled potable water, be provided with soap, individual towels and hand towels, and be cleaned and disinfected at least once per shift, when they have been used.
O.C. 393-2011, s. 9.