National baseline
Start with the NBC provisions for fire dampers at fire separation penetrations and smoke dampers at smoke barrier penetrations.
Canadian building code question
What are the building code requirements for smoke and fire dampers in Canada?
Fire dampers are required where ducts penetrate fire separations. Smoke dampers are required where ducts penetrate smoke barriers or where smoke control systems require them. Combination fire-smoke dampers serve both functions. Requirements depend on the fire separation rating, duct size, and smoke control provisions.
Damper requirements are among the most frequently missed items in building code compliance because they depend on fire separation ratings, smoke control provisions, and duct routing — all of which interact. Missing a required damper at a duct penetration can compromise the fire separation and void the building's fire safety strategy.
What to check first
- Fire dampers are triggered by duct penetrations through rated fire separations — the damper rating must match or exceed the separation rating.
- Smoke dampers are triggered by duct penetrations through smoke barriers or by smoke control system requirements.
- Exceptions exist for certain duct sizes, separation ratings, and conditions — but they must be verified against the specific code provisions.
Jurisdiction notes
Province and edition check
Some provinces amend damper requirements or add provisions for specific occupancy types or smoke control configurations.
Referenced standards
ULC standards for fire dampers and smoke dampers are referenced by the NBC and govern testing, installation, and maintenance requirements.
Work through it in this order
- Identify all duct penetrations through fire separations and smoke barriers on the project.
- Determine the fire resistance rating of each penetrated separation to select the required damper rating.
- Check whether smoke dampers are required based on smoke control provisions or smoke barrier penetrations.
- Verify exceptions for small ducts, low-rated separations, or specific occupancy conditions.
Common questions
Is a fire damper always required where a duct penetrates a fire separation?
In most cases, yes. However, the code provides limited exceptions for certain duct sizes and low-rated separations. Verify the specific exception conditions before omitting a damper.
What is the difference between a fire damper and a smoke damper?
A fire damper closes when activated by heat to maintain the fire resistance of a penetrated separation. A smoke damper closes when activated by a smoke detection or control system to limit smoke spread. Combination dampers serve both functions.
Do fire dampers require periodic inspection?
Yes. Referenced standards and most provincial fire codes require periodic inspection and testing of fire and smoke dampers. The inspection interval depends on the standard and jurisdiction.