2024 Ontario Building Code: Makeup Air and Air Intake Requirements for London, Ontario Projects
Sarah's Expert Insight
OBC Compliance Specialist
"In my experience at empcontracting.ca Inc., the 0.3m height requirement for air intakes is a bare minimum; for properties in Muskoka or London, we often recommend higher placements to avoid blockage during heavy lake-effect snowfalls. Additionally, ensuring that makeup air is properly tempered and interlocked is vital for preventing backdrafting in high-performance homes, which is a common audit failure in Ontario residential projects."
Understanding the complexities of the 2024 Ontario Building Code (OBC) is essential for ensuring safety and efficiency in your next build. As empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize compliance with Section 6.3.2 to guarantee optimal indoor air quality and system performance.
6.3.2.8. Makeup Air Requirements
In modern ventilating systems that exhaust air to the outdoors, the OBC mandates the provision of makeup air. This ensures that the operation of exhaust and combustion equipment is not adversely affected by pressure imbalances.
Key Compliance Factors:
- System Interlocking: Makeup air facilities must be interlocked with the exhaust devices they serve to ensure they operate simultaneously.
- Air Tempering: In regions like London, Oakville, and Muskoka, winter air must be tempered (heated) before it reaches occupied parts of the building to maintain indoor design temperatures.
6.3.2.9. Strategic Placement of Supply, Return, and Exhaust Openings
The placement and protection of air openings are critical for preventing contamination and ensuring mechanical longevity. Protective grilles must be installed on openings less than 2m above the floor to prevent the passage of objects larger than 15mm.
Outdoor Air Intake Clearances
To prevent the intake of pollutants, the 2024 OBC specifies minimum distances from contaminant sources:
- Property Maintenance: Intakes must be at least 0.3m above landscape grade or roofs, specifically accounting for anticipated snow accumulation.
- Garage and Traffic: Minimum 4.5m from garage entries (5+ vehicles) and 7.6m from high-volume thoroughfares.
- Sanitary and Kitchen Vents: Intakes must be 3.5m from sanitary vents and 3.0m from kitchen exhaust outlets.
By partnering with empcontracting.ca Inc. your construction contractor in London, Ontario, you ensure that every vent and intake on your property meets these rigorous safety standards.
Disclaimer: This content is generated from the Ontario Building Code for educational purposes. Always consult with a licensed professional engineer or your local building department before starting any construction project in London, Ontario.