1. Exposed type: The sound absorbing material is placed directly on the inner surface of the meeting room. For example, mineral wool sound-absorbing boards, fabric blankets, glass wool boards and drilling sound structures are arranged under the keel of the wall or ceiling.
2. Decorative type: Make various finishing materials and structures on the surface of the sound-absorbing material to meet the decoration requirements, such as covering the sound-absorbing foam with flame-retardant fabric, brocade, trumpet cloth, or setting wooden strips, metal pipes, etc.
3. Concealed type: Various sound-absorbing materials or structures are arranged behind the sound-transmitting barrier.