What are fire door ratings classifications?

Fire door ratings classifications indicate the level of fire resistance a door can provide, typically measured in minutes, such as 20, 45, 60, or 90 minutes. These ratings are determined through standardized tests that assess how long the door can withstand fire and prevent its spread. Fire doors are categorized based on their materials, construction, and intended use, ensuring they meet safety standards in various building types. Proper installation and maintenance are crucial for these doors to function effectively in a fire emergency.