Fire rated doors are an important part of fire protection in Canadian homes, apartments, commercial buildings, offices, institutional facilities, and industrial properties. A properly selected and installed fire-rated door assembly can help slow the spread of fire and smoke, providing occupants with additional time to evacuate and helping protect different areas of a building.

In Canada, fire-door requirements are connected to the building's occupancy, construction, fire-separation requirements, and the location of the opening. The National Building Code of Canada provides model requirements, while provinces and territories determine which editions and amendments apply in their jurisdictions. The National Research Council of Canada advises building owners and professionals to check with the appropriate provincial, territorial, or municipal authority for the applicable requirements.

What Are Fire-Rated Doors?

Fire rated doors are doors designed and tested as part of an assembly to resist fire for a specified period. The rating indicates how long the tested assembly can provide its required fire-protection performance under standardized test conditions.

A fire door should not be considered only as a door slab. The complete assembly can include the door, frame, hinges, closer, latch, glazing, seals, and other components. Canadian fire-door testing is associated with CAN/ULC-S104, which covers fire tests for door assemblies and evaluates components intended for use in wall openings to retard the passage of fire.

This is important because replacing one component with an incompatible product can affect the performance of the complete assembly. Buyers should therefore review the manufacturer's certification, approved components, installation instructions, and rating information before purchasing or installing a fire-rated door.

Understanding 90-Minute Fire Ratings

A 90 minute fire rated door is designed for an opening where a 90-minute fire-protection rating is required or appropriate according to the applicable design and code requirements. The exact rating required depends on the fire-resistance rating of the surrounding wall or separation and the building's specific conditions.

It is important not to assume that every fire separation requires a 90-minute door. Fire-protection requirements can vary significantly between applications. A professional designer, contractor, architect, or local authority having jurisdiction can help determine the correct rating.

For Canadian projects, the current National Building Code of Canada 2025 and National Fire Code of Canada 2025 are important references, but local adoption and amendments must also be considered.

A 90-minute rating can be especially relevant in applications where a higher level of fire protection is needed, such as certain commercial, institutional, multi-unit residential, service, or industrial areas. However, the door's rating should always be selected according to the complete building design rather than simply choosing the highest available rating.

Why Choose a Prehung Fire-Rated Door?

A prehung fire rated door is supplied with the door already installed in a compatible frame. This configuration can simplify installation because the door and frame are supplied as a coordinated unit.

For renovation projects, commercial construction, and new developments, a prehung configuration can make installation more straightforward. However, fire-rated assemblies still need to be installed according to their listing and manufacturer's requirements.

The frame is particularly important because it forms part of the tested assembly. CAN/ULC-S105 addresses fire door frames meeting the performance requirements of CAN/ULC-S104.

When purchasing a prehung fire-rated unit, Canadian buyers should verify:

• The required fire-protection rating
• Door and frame certification
• Approved hardware
• Hinge specifications
• Latching and closing requirements
• Any required fire or smoke seals
• Installation instructions
• Approved glazing, if applicable
• Size and handing
• Compatibility with the wall assembly

Selecting the complete assembly rather than mixing unrelated components can help reduce installation and compliance problems.

Fire-Rated Slab Doors for Replacement Projects

A fire rated slab door is the door leaf supplied without a frame. This option may be useful when an existing frame is suitable for the replacement door and the complete installation can meet the required fire-door specifications.

Slab doors can provide flexibility for certain renovation and replacement applications. However, buyers should not assume that any existing frame can automatically be paired with a fire-rated slab. The door, frame, hardware, and other components must be compatible with the applicable listing or tested assembly.

For this reason, slab replacement projects should be carefully evaluated before ordering. The existing opening should be measured accurately, and the replacement door should be verified for its intended application and rating.

Where Fire-Rated Doors Are Commonly Used in Canada

Fire-rated doors can be found in many Canadian building types. Common applications include:

Multi-Unit Residential Buildings

Apartment buildings, condominiums, and other multi-unit properties may require fire-rated openings as part of fire separations. Doors can help separate suites, corridors, utility areas, mechanical rooms, and other spaces where fire protection is required.

Commercial Buildings

Offices, retail properties, restaurants, warehouses, and other commercial buildings may use fire-rated assemblies around specific rooms, corridors, service areas, and other protected openings.

Institutional Facilities

Schools, healthcare facilities, care environments, and public buildings often have specialized fire-safety requirements. Door selection should be coordinated with the building's fire-protection strategy and applicable regulations.

Garages and Service Areas

Some interior openings connecting garages, mechanical spaces, storage rooms, or service areas may require fire-protection measures. The required rating depends on the building configuration and applicable code provisions.

Materials and Construction

Fire-rated doors are available in several construction types. Steel doors are widely used in commercial and industrial environments because they can provide durability and resistance to demanding conditions. Wood-core fire doors can also be used in suitable applications when they are manufactured, tested, and listed for the required rating.

The appearance of a fire-rated door can vary considerably. Options may include flush designs, panel-style appearances, vision lites, and other configurations where permitted by the relevant certification.

Glazing deserves particular attention. A fire-rated door with glass must use approved glazing and framing components suitable for the door's rating and tested assembly. UL Solutions in Canada identifies CAN/ULC-S104 as a relevant fire-test standard for door assemblies and provides testing and certification services for building products.

Installation Matters as Much as Door Selection

Choosing the correct fire rated doors is only the first step. Installation is equally important. An incorrectly installed door may not perform as intended during a fire.

The frame should be properly secured, hinges should be appropriate for the assembly, and the door should close and latch correctly. Where required, approved seals, closers, and other hardware should be installed according to the manufacturer's instructions.

Building owners should also avoid making unauthorized modifications, such as drilling unnecessary holes, changing hardware, trimming the door beyond permitted limits, or installing unapproved glass.

Routine inspection and maintenance are important as well. Fire doors should remain functional and unobstructed, and damaged components should be repaired or replaced using compatible products.

How Canadian Buyers Can Choose the Right Door

Before purchasing, start by identifying the exact opening and its purpose. Determine whether the project requires a slab or prehung unit and establish the required fire-protection rating through the applicable code, plans, specifications, or authority having jurisdiction.

Next, verify certification and compatibility. Do not rely solely on a product description that says a door is "fire rated." Request documentation showing the applicable rating and testing or certification information.

For a project requiring a 90 minute fire rated door, confirm that the complete door assembly—not merely the door leaf—is appropriate for the intended application.

For replacement work, determine whether a fire rated slab door can be used with the existing frame or whether a complete replacement assembly is more appropriate. For new construction, a prehung fire rated door may provide a convenient coordinated solution when specified and installed correctly.

Final Considerations for Canadian Projects

Fire protection is a critical part of building design across Canada. The right door can contribute to a building's overall fire-safety strategy, but the rating, construction, hardware, frame, installation, and maintenance all need to work together.

The 2025 National Building Code and National Fire Code are the latest national model-code publications, but Canadian requirements can vary by jurisdiction because provinces and territories adopt and amend codes.

Whether you are renovating an existing property, constructing a commercial building, or replacing an interior opening, choose products with appropriate documentation and ensure they are installed according to the manufacturer's approved requirements.

A properly specified 90 minute fire rated door, coordinated prehung fire rated door, or certified fire rated slab door can be an effective component of a broader fire-protection system when it is selected for the correct application and installed as part of a compliant assembly.