A-level ceiling, B1-level wall, and B1-level floor.

1. Class A ceiling: The ceiling of the concert hall uses Class A decoration materials. Class A decoration materials have high fire resistance and can effectively prevent the spread of fire. In the concert hall, the ceiling is the highest part. The use of Class A decoration materials can provide higher fire safety and reduce the risk of fire.

2. B1-level walls: The walls are made of B1-level decoration materials. B1-level decoration materials have good fire resistance and can effectively inhibit the spread of fire. The walls of the concert hall are responsible for the supporting structure and sound insulation functions. Choosing decoration materials no lower than B1 level can increase the fire resistance of the walls and protect the lives of personnel.

3. B1 level floor: The ground is made of B1 level decoration materials. As the ground is the basis for people’s activities in the concert hall, the fireproof performance is equally important. Choosing B1-level decoration materials can effectively slow down the spread of fire, buy valuable time for personnel evacuation, and improve overall fire safety.