NEW for the 2024 OBC:
Section 9.32. Ventilation has been reorganized and expanded.
- Houses are no longer categorized as Type I, Type II etc.
- Ventilation requirements have been split into “heating season ventilation” and “non-heating season ventilation” (see 9.32.2. and 9.32.3.)
- Prescriptive requirements for make-up air are now provided (see 9.32.3.8.)
- An additional 15 pages of appendix notes have been added showing acceptable arrangements of equipment for different mechanical ventilation approaches. (See multiple appendix notes starting with A-9.32.1.2.(2))
NEW for the 2024 OBC:
Section 9.33.Heating and Air Conditioning has been expanded.
- Residential duct system requirements previously found in 6.2.4. are now in 9.33.
- Additional requirements for radiators and convectors, chimneys, piping and refrigeration systems are also found in 9.33.
- Ducts serving a dwelling unit in a house with a secondary suite are specifically prohibited from serving any other part of the house. (see 9.33.1.1.(3))