| 6.3.1. |
Ventilation |
| 6.3.1.1. |
Required Ventilation
- Except as provided in Sentence (3), all buildings shall be ventilated in accordance with this Part.
- Except in storage garages covered by Article 6.3.1.4., 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" (except Addendum n).
- Self-contained heating-season mechanical ventilation systems serving only one dwelling unit shall comply with
- this Part, or
- Subsection 9.32.3.
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| 6.3.1.2. |
Crawl Spaces and Attic or Roof Spaces
- Unconditioned and unoccupied crawl spaces and unconditioned and unoccupied attic or roof spaces shall be ventilated by natural or mechanical means as required by Part 5.
(See Note A-6.3.1.2.(1).)
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| 6.3.1.3. |
Natural Ventilation
- Except as permitted by Sentence (2), the ventilation required by Article 6.3.1.1. shall be provided by mechanical ventilation, except that it can be provided by natural ventilation or a combination of natural and mechanical ventilation in
- buildings of other than residential occupancy having an occupant load of not more than one person per 40m2 during normal use,
- buildings of industrial occupancy where the nature of the processes contained therein permits or requires the use of large openings in the building envelope even during the winter, and
- seasonal buildings not intended to be occupied during the winter.
- 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.
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| 6.3.1.4. |
Ventilation of Storage Garages
- Except as provided in Sentences (4) and (6), an enclosed storage garage for five or more motor vehicles shall have a mechanical ventilation system designed to
- limit the concentration of carbon monoxide to not more than 100 parts per million parts of air,
- limit the concentration of nitrogen dioxide to not more than 3 parts per million parts of air, where the majority of the vehicles stored are powered by diesel-fuelled engines, or
- 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 (see Article 3.3.1.20.).
(See also Sentence 3.3.5.4.(4).) (See Note A-6.3.1.4.(1).)
- Mechanical ventilation systems provided in accordance with Clause (1)(a) shall be controlled by carbon monoxide monitoring devices, and systems provided in accordance with Clause (1)(b) shall be controlled by nitrogen dioxide or other acceptable monitoring devices.
(See Note A-6.3.1.4.(2).)
- 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.
- In storage garages subject to the requirements of Sentences (1) and (2), where motor vehicles are parked by mechanical means, the ventilation requirements may be reduced by one half.
- Except as provided in Sentence (6), ticket and attendant booths of storage garages shall be pressurized with a supply of uncontaminated air.
- The requirements of Sentences (1) to (5) shall not apply to open-air storeys in a storage garage.
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| 6.3.1.5. |
Heat Recovery Ventilators
- Heat recovery ventilators with rated capacities of not less than 25 L/s and not more than 200 L/s shall be installed in accordance with Subsection 9.32.3.
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| 6.3.1.6. |
Indoor Air Contaminants
(See Note A-6.3.1.6.)
- 1) Air contaminants of concern that are released within buildings shall
- be removed insofar as is possible at their points of origin, and
- not be permitted to accumulate in concentrations greater than those permitted by applicable provincial or territorial requirements or, in the absence of such requirements, by good engineering practice such as that described in the publications listed in Sentence 6.2.1.1.(1), measured using the methodology described therein.
- 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 the spread of such contamination to other occupied parts of the building.
- Heating, ventilating and air-conditioning systems shall be designed to minimize the growth and spread of bio-contaminants.
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| 6.3.1.7. |
Commercial Cooking Equipment
- Except as provided in Article 3.6.3.5., systems for the ventilation of commercial cooking equipment shall be designed, constructed and installed to conform to NFPA 96, "Ventilation Control and Fire Protection of Commercial Cooking Operations."
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