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What are the classifications of fire doors?
1. Wooden fire doors: These are made by applying fire-resistant coatings to the surface of wooden doors, or by covering them with decorative fire-retardant panels, to meet fire safety requirements—though their fire performance is slightly inferior.
2. Steel Fire Doors: These doors are made from standard steel sheets and feature a core filled with fire-resistant materials such as rock wool, ensuring they meet stringent fire protection requirements. Currently, several domestic manufacturers produce fire doors whose door opening dimensions—width and height—are standardized according to the commonly used national building standards categorized by fire-resistance ratings. Additionally, the ISO standards for fire doors are divided into three grades: Class A, Class B, and Class C.
3. Class A Fire Doors: These doors have a fire-resistance rating of 12 hours and are typically made entirely of steel, with no glass windows. Class A fire doors are designed to prevent the spread of fire in the event of a blaze.
4. Class B Fire-Resistant Doors: These doors have a fire-resistance rating of all-steel construction, with a small glass panel installed in the door. The glass used must be either 5mm-thick wired glass or fire-resistant glass. Class B fire doors are primarily designed to prevent the spread of fire through openings during a fire. High-quality wooden fire doors can also meet the standards for Class B fire-rated doors.
5. Class C Fire-Resistant Door: With a fire-resistance rating of 0.6 hours, this is a fully steel door equipped with a small glass window in the door panel, featuring 5mm-thick wired glass. Most wooden fire doors fall within this class. Typically used as inspection doors for equipment shafts.
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