6.2.2.

(1) Except as provided in Sentence (3), all buildings shall be ventilated in accordance with this Part.

(2) Except in storage garages and repair garages covered by Article 6.2.2.3., the rates at which outdoor air is supplied in buildings by ventilation systems shall be not less than the rates required by ANSI/ASHRAE 62, “Ventilation for Acceptable Indoor Air Quality”.

(3) Self-contained mechanical ventilation systems that serve only one dwelling unit and that conform to the requirements of Subsection 9.32.3. shall be considered to satisfy the requirements of this Article.

(4) Live/work units shall be mechanically ventilated in accordance with the requirements of Sentence (1).

(1) Except as permitted by Sentence (2), the ventilation required by Article 6.2.2.1.v1 shall be provided by mechanical ventilation except that it can be provided by natural ventilation or a combination of natural and mechanical ventilation in,

(a) buildings of other than residential occupancy having an occupant load of not more than one person per 40 m² during normal use,

(b) buildings of industrial occupancy where the nature of the process contained in them permits or requires the use of large openings in the building envelope even during the winter, or

(c) seasonal buildings not intended to be occupied during the winter.

(2) Where climatic conditions permit, buildings containing occupancies other than residential occupancies, may be ventilated by natural ventilation methods in lieu of mechanical ventilation where engineering data demonstrates that such a method will provide the required ventilation for the type of occupancy.

(1) Except as provided in Sentences (4) and (6), an enclosed storage garage shall have a mechanical ventilation system designed to,

(a) limit the concentration of carbon monoxide to not more than 100 parts per million of air when measured between 900 mm and 1 200 mm from the floor, where the majority of the vehicles stored are powered by gasoline fuelled engines,

(b) limit the concentration of nitrogen dioxide to not more than 3 parts per million parts of air when installed in accordance with manufacturer’s instructions, where the majority of the vehicles stored are powered by diesel fuelled engines, or

(c) provide, during operating hours, a continuous supply of outdoor air at a rate of not less than 3.9 L/s for each square metre of floor area.

(2) Mechanical ventilation systems provided in accordance with Clause (1)(a) shall be controlled automatically by carbon monoxide monitoring devices and systems provided in accordance with Clause (1)(b) shall be controlled automatically by nitrogen dioxide or other acceptable monitoring devices, located so as to provide full protection throughout the storage garage.

(3) Mechanical ventilation systems provided in accordance with Sentence (1) shall be designed such that the pressure in the storage garage is less than the pressure in adjoining buildings of other occupancy, or in adjacent portions of the same building having a different occupancy.

(4) In storage garages subject to the requirements of Sentence (1), where motor vehicles are parked by mechanical means, the ventilation requirements may be reduced by one half.

(5) Except as provided in Sentence (6), ticket and attendant booths of storage garages shall be pressurized with a supply of outdoor air.

(6) The requirements of Sentences (1) to (5) shall not apply to open-air storeys in a storage garage.

(7) A repair garage shall have a mechanical ventilation system designed to limit the exposure of workers to carbon monoxide to below the time weighted average concentration of 35 parts per million for a normal 8 hour workday or 40 hour work week.

(8) In a repair garage, when a repair bay is not immediately adjacent to an outside garage door opening, a system capable of providing continuous general ventilation of not less than 700 L/s per internal bay shall be provided.

(9) The general ventilation system described in Sentence (8) shall be designed to,

(a) operate continuously, or

(b) be controlled automatically by carbon monoxide monitoring devices, located so as to provide full protection throughout the repair garage.

(10) The general ventilation system described in Sentence (8) is not required when tail pipes of vehicles are directly connected to local mechanical exhaust systems that terminate outdoors.

(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 6.2.1.1.(1)v1.

(4) Mechanical rooms containing refrigeration equipment shall be ventilated in accordance with CSA-B52, “Mechanical Refrigeration Code”.

(1) Systems serving spaces that contain hazardous gases, dusts or liquids shall be designed, constructed and installed in conformance with the provisions of the Fire Code made under the Fire Protection and Prevention Act, 1997, or in the absence of requirements pertinent to such systems in the Fire Code, to good engineering practice such as is described in the publications of the National Fire Protection Association and in the National Fire Code of Canada.

(1) All commercial cooking equipment shall be provided with ventilation systems designed, constructed and installed to conform to NFPA 96, “Ventilation Control and Fire Protection of Commercial Cooking Operations”, except as required by Sentence 3.6.3.1.(1) and Article 3.6.4.2.

(2) Fire protection systems for high efficiency, high temperature commercial cooking equipment using vegetable oil or animal fat shall conform to,

(a) UL 300, “Fire Extinguishing Systems for Protection of Restaurant Cooking Areas”, or

(b) ULC/ORD-C1254.6, “Fire Testing of Restaurant Cooking Area Fire Extinguishing System Units”.

(1) Every crawl space and every attic or roof space shall be ventilated by natural or mechanical means.