Ventilation Systems Not Coupled with Forced Air Heating Systems
(1) This Article applies to a mechanical ventilation system in a dwelling unit that,
(a) does not contain a forced air heating system, or
(b) contains a forced air heating system which is not used for circulation of the ventilation air.
(2) The mechanical ventilation system shall introduce air to and circulate air throughout the dwelling unit in compliance with this Article.
(3) The mechanical system in this Article shall include a heat recovery ventilator installed in accordance with Article 9.32.3.11.
(4) Outdoor air shall be distributed by a ductwork system from the heat recovery ventilator required in Sentence (3) to each bedroom, to any storey without a bedroom and, if there is no storey without a bedroom, to the principal living area.
(5) A supply duct from the outdoors to the heat recovery ventilator required in Sentence (3) and a main distribution trunk duct shall be provided and shall be sized according to Part 6, except that the supply duct and the main distribution trunk duct may be sized according to Table 9.32.3.7.A. where,
(a) the total duct length from the outdoor hood to any supply register does not exceed 21 m, and
(b) the total number of fittings does not exceed 8.
(6) The outside air supply duct required by Sentence (5) shall not be considered to provide combustion and/or dilution air to fuel-burning appliances.
(7) Branch supply ducts leading from the main distribution trunk duct required by Sentence (5) to the rooms to which outdoor air is to be distributed shall be provided and shall be sized according to Part 6, except that the branch supply ducts may be sized according to Table 9.32.3.7.B. where,
(a) the total duct length from the outdoor hood to any supply register does not exceed 21 m, and
(b) the total number of fittings does not exceed 8.
Article 9.32.3.7 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.
