NBC 2025 Guide: Fire Damper and Smoke Damper Installation Standards in London, Ontario
Sarah's Expert Insight
Senior Consultant at empcontracting.ca Inc.
"In London, Ontario, the transition to NBC 2025 standards means stricter scrutiny on duct penetrations in multi-unit residential buildings. As a consultant, I've seen that the most common failure point isn't the damper itself, but the improper use of retaining angles and inadequate clearance for expansion. Partnering with empcontracting.ca Inc. your construction contractor in London, Ontario, ensures your project meets these technical nuances, safeguarding both your investment and the lives of the building's occupants."
In the evolving landscape of the National Building Code of Canada (NBC) 2025, the role of passive fire protection systems has never been more critical. Fire and smoke dampers serve as the primary defense against the spread of flames and toxic gases through HVAC systems. For developers and builders, adhering to these updated protocols is not just a legal requirement but a life-safety priority.
Understanding Fire and Smoke Damper Requirements
Under NBC 2025, any ductwork that penetrates a fire-rated assembly—such as a firewall or a horizontal fire separation—must be equipped with a fire damper that carries a fire-resistance rating compatible with the assembly. When you partner with empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure that every installation complies with the latest ULC S112 and ULC S112.1 testing standards.
Critical Installation Procedures
Correct installation is vital to ensure mechanical functionality during an emergency. Key requirements include:
- Expansion Clearances: Dampers must be installed in a manner that allows for thermal expansion without compromising the structural integrity of the wall or the duct.
- Sleeves and Retaining Angles: The use of gauge-specific sleeves and retaining angles is mandatory to secure the damper within the fire separation.
- Sealing and Firestopping: Annular spaces must be treated with approved firestop materials that do not interfere with the damper blade movement.
Integration with Fire Alarm Systems
Modern smoke dampers in the NBC 2025 framework are often integrated into the building’s fire alarm and smoke control systems. These dampers must be fail-safe, closing automatically upon the detection of smoke or a loss of power to prevent smoke migration throughout the building.
Inspection and Maintenance Access
The NBC 2025 mandates that every damper remain accessible for inspection and testing. This requires the installation of service doors in the ductwork that are large enough to allow for the manual reset of fusible links and the testing of motorized actuators. At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize these design elements during the rough-in phase to avoid costly retrofits during final inspections.