2024 OBC Fire Door Regulations: Guide to Self-Closing and Hold-Open Devices

Understanding the latest standards in the 2024 Ontario Building Code (OBC) is essential for maintaining safety and compliance in any commercial or institutional build. As you plan your next project, trust empcontracting.ca Inc. your construction contractor in London, Ontario, to navigate these complex fire separation requirements.

OBC 3.1.8.12: Door Clearances and Fire Ratings

Correct installation is vital for fire door integrity. According to Article 3.1.8.12, doors must maintain specific clearances to ensure they function correctly during a fire event:

• Maximum 6 mm clearance at the bottom.
• Maximum 3 mm clearance at the sides and top.

School and Educational Facilities

In elementary and secondary schools, door assemblies meeting specific criteria under Part 9 are permitted in fire separations with a 30-minute fire-resistance rating.

OBC 3.1.8.13: Mandatory Self-Closing Devices

Most doors within a fire separation must be equipped with a self-closing device. However, there are notable exceptions for buildings not exceeding 3 storeys in height:

• Classroom doors in schools (unless it is a hazardous classroom).
• Small business or personal service offices, provided they are not in dead-end corridors or hotels.
• Specific patient or resident sleeping rooms in hospitals or long-term care facilities.

OBC 3.1.8.14: Hold-Open Devices and Safety Integration

Hold-open devices are permitted on many fire doors but must be designed to release automatically. In buildings equipped with fire alarm systems, these devices must release upon:

• Any fire alarm signal (Single-stage systems).
• Alert signals or smoke detector actuation (Two-stage systems).

Mandatory Smoke Detector Release

Automatic release via smoke detection is mandatory for doors serving public corridors, exit doors, and assembly or care occupancies. This ensures that smoke migration is halted immediately upon detection, protecting egress routes for occupants.