Code Library › Volume 1 › Section 6.3 — Ventilation Systems

PART 6 — HEATING, VENTILATING AND AIR-CONDITIONINGUpdated for the 2024 Ontario Building Code

6.3.3.2.Masonry or Concrete Chimneys

(1) Rectangular masonry or concrete chimneys not more than 12 m in height shall conform to Part 9 if they serve
  (a) appliances with a combined total rated heat output of 120 kW or less, or
  (b) fireplaces.

  (2) Masonry or concrete chimneys other than those described in Sentence (1) shall be designed and installed in
  conformance with the appropriate requirements in NFPA 211, “Standard for Chimneys, Fireplaces, Vents and Solid Fuel-
  Burning Appliances.”

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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.