The Ontario Building Code | Air Contaminants
188.8.131.52. 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 184.108.40.206.(1).
(4) Mechanical rooms containing refrigeration equipment shall be ventilated in accordance with CSA-B52, "Mechanical Refrigeration Code".