Acts and Regulations

91-191 - General

Section 20
Disposition versions

Full text
Ventilation
20(1)An employer shall ensure that a place of employment is adequately ventilated by
(a) if the place of employment is a health care facility, mechanical ventilation conforming to CSA standard Z317.2-10, “Special requirements for heating, ventilation and air-conditioning (HVAC) systems in health care facilities” (R2015) or a standard offering equivalent or better protection, and
(b) if the place of employment is not a health care facility and
(i) mechanical ventilation is practical, mechanical ventilation conforming to ANSI/ASHRAE standard 62.1-2010 “Ventilation for Acceptable Indoor Air Quality” or a standard offering equivalent or better protection, and
(ii) mechanical ventilation is not practical, natural ventilation as long as the concentration of air contaminants, ambient temperature and relative humidity do not exceed levels stipulated in ANSI/ASHRAE standard 62.1-2010 “Ventilation for Acceptable Indoor Air Quality” or a standard offering equivalent or better protection.
20(2)Repealed: 2022-27
20(3)An employer shall ensure that a ventilation system prevents the return of exhausted air through the outside air intake.
20(4)An employer shall ensure that exhausted air is replaced by air that
(a) does not constitute a hazard to the health of employees,
(b) does not contain air contaminants in concentrations that exceed 10% of the occupational exposure limits,
(c) is heated, when necessary, to maintain the minimum temperature specified in section 21, and
(d) is properly distributed so as not to cause undue drafts or disturbance of conditions.
2022-27; 2022-79
Ventilation
20(1)An employer shall ensure that a place of employment is adequately ventilated by
(a) if the place of employment is a health care facility, mechanical ventilation conforming to CSA standard Z317.2-10, “Special requirements for heating, ventilation and air-conditioning (HVAC) systems in health care facilities” (Reaffirmed 2015) or a standard offering equivalent or better protection, and
(b) if the place of employment is not a health care facility and
(i) mechanical ventilation is practical, mechanical ventilation conforming to ANSI/ASHRAE standard 62.1-2010 “Ventilation for Acceptable Indoor Air Quality” or a standard offering equivalent or better protection, and
(ii) mechanical ventilation is not practical, natural ventilation as long as the concentration of air contaminants, ambient temperature and relative humidity do not exceed levels stipulated in ANSI/ASHRAE standard 62.1-2010 “Ventilation for Acceptable Indoor Air Quality” or a standard offering equivalent or better protection.
20(2)Repealed: 2022-27
20(3)An employer shall ensure that a ventilation system prevents the return of exhausted air through the outside air intake.
20(4)An employer shall ensure that exhausted air is replaced by air that
(a) does not constitute a hazard to the health of employees,
(b) does not contain air contaminants in concentrations that exceed 10% of the occupational exposure limits,
(c) is heated, when necessary, to maintain the minimum temperature specified in section 21, and
(d) is properly distributed so as not to cause undue drafts or disturbance of conditions.
2022-27
Ventilation
20(1)An employer shall ensure that a place of employment is adequately ventilated by
(a) natural ventilation which introduces outside air provided by openings having a combined area equal to at least 5% of the floor area, or
(b) mechanical ventilation conforming to ASHRAE standard 62-1989, “Ventilation for Acceptable Indoor Air Quality”.
20(2)Where mechanical ventilation is used and the ASHRAE standard referred to in subsection (1) does not specify supply rates of acceptable outside air required, an employer shall ensure that the minimum amount of outside air introduced shall be 8 litres/second/person.
20(3)An employer shall ensure that a ventilation system prevents the return of exhausted air through the outside air intake.
20(4)An employer shall ensure that exhausted air is replaced by air that
(a) does not constitute a hazard to the health of employees,
(b) does not contain air contaminants in concentrations that exceed 10% of the threshold limit values,
(c) is heated, when necessary, to maintain the minimum temperature specified in section 21, and
(d) is properly distributed so as not to cause undue drafts or disturbance of conditions.