The Ontario Building Code | Air Contaminants
6.2.2.4. Air Contaminants
(1) Air contaminants released within buildings shall be removed insofar as possible at their points of origin and shall not be permitted to accumulate in concentrations greater than permitted in the ACGIH, "industrial Ventilation Manual".
(2) Systems serving spaces that contain sources of contamination and systems serving other occupied parts of the building but located in or running through spaces that contain sources of contamination shall be designed in such a manner as to prevent spreading of such contamination to other occupied parts of the building.
(3) Heating, ventilating and air-conditioning systems shall be designed to minimize growth of micro-organisms according to good engineering practice as described in Sentence 6.2.1.1.(1).
(4) Mechanical rooms containing refrigeration equipment shall be ventilated in accordance with CSA-B52, "Mechanical Refrigeration Code".
In Plain Language
Air contaminants released within buildings must be removed at their point of origin wherever possible, and can't be allowed to accumulate beyond the concentration limits set elsewhere in this article.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.