The Ontario Building Code | Make-up Air
188.8.131.52. Make-up Air
(1) In ventilating systems that exhaust air to the outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors, provision shall be made for the admission of a supply of make-up air in sufficient quantity so that the operation of the exhaust system and other exhaust equipment or combustion equipment is not adversely affected.
(2) Make-up air facilities required by Sentence (1) shall be interlocked with the exhaust devices they serve so that both operate together.
(3) Where make-up air facilities are intended to introduce air directly from the outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors to occupied parts of the building in winter, they shall incorporate means of tempering that air to maintain the indoor design temperature.