- 12
- Oct
1 Hour Fire Doors
The fire endurance of fire doors is divided into Class A, Class B and Class C. Among them, the fire endurance of Class B fire door shall not be less than 1.0h. Class B fire doors shall be used for smoke proof staircases and doors leading to front rooms, doors of closed staircases in high-rise buildings, and doors of fire elevator front rooms or shared front rooms.