Fire Door Ratings in Canada: 20-Min, 45-Min, 90-Min & 3-Hour ULC Standards
Quick answer: Fire door ratings – commonly 20, 45, 60, 90, or 180 minutes – indicate how long a door assembly is certified to resist fire and smoke. The rating must match or exceed the fire-resistance rating of the wall the door is installed in. Understanding fire door ratings is critical for the safety and…