The Ontario Building Code | Ventilation of Rooms and Spaces
22.214.171.124. ventilation of Rooms and Spaces
(1) Except as permitted in Sentence (2), rooms or spaces in a dwelling unit shall be ventilated by natural means in accordance with Subsection 9.32.2.
Note: On July 1, 2017, Sentence 126.96.36.199.(1) of Division B of the Regulation is amended by striking out "dwelling unit" and substituting "residential occupancy". (See: O. Reg. 139/17, s. 125)
(2) The natural ventilation of rooms or spaces required in Sentence (1) may be provided by mechanical means.
(3) Where a room or space is not provided with natural ventilation as described in Sentence (1), mechanical ventilation shall be provided to exhaust inside air from or to introduce outside air to that room or space at the rate of one-half air change per hour if the room or space is mechanically cooled in summer, and one air change per hour if it is not.
9.32.2. Natural ventilation