OBC VOLUME 2 · APPENDIX A · NOTES TO PART 12Updated for the 2024 Ontario Building Code
Try BUILDAiD Beta
Appendix A — Explanatory Notes to Part 12
Appendix A explanatory notes for Part 12 of Division B of the 2024 Ontario Building Code. These notes are advisory: they explain the intent behind code provisions and how to apply them.
On this page:
A-12.3.1.5.(1)
A-12.3.1.5.(1)
A-12.3.1.5.(1)Residential Furnaces.
Where an existing furnace without a brushless direct current motor is replaced in a dwelling unit or house, replacement with a
furnace with similar characteristics would provide an acceptable performance level, since the furnace flow rate and ductwork
size would be compatible and this alteration to the heating and cooling system would not reduce the performance level.
Explanatory Material for Division C
Understand any provision in seconds
BUILDAiD Assist explains any article of the building code in plain English — with exact citations, exceptions and related requirements.
Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.