The open design and density of CFAB cellulose soundproofing and insulation panels increases sound absorption to control and deaden sound. CFAB cellulose foam board panels achieve high Noise Reduction Coefficient (NRC) ratings based on the density specified. The chart below represents NRC ratings using standard weight material. Sound Transmission Classification (STC) ratings have been done for specific applications. STC values are determined for all of the construction materials in an assembly. The STC ratings exceed the values attained with commonly used acoustical materials.