1: partition wall 1-2 cm, new light steel keel wall with sound insulation cotton.
2; Non-woven fabric is pasted on the surface of light steel keel wall to prevent the dust of sound insulation cotton from going out.
3. Add a layer of large core board on the surface of light steel keel wall as the firmware of sound-absorbing board.
4. Paste the mineral wool sound-absorbing board.