... hotel ,conference room, gymnasium, ,school, library, auditorium and so on. 11.Colors: A wide range of colors in woven fabrics12 ... find additional photos, color choices, installation information, etc. on our website. 13.Sound Absorption Coefficient (NRC) of sheep wool thermo ... m³)norminal thickness (mm)test installationfrequency (HZ)NRC1252505001000200040006025sticking on the ground0.20 0.45 1.02 1.140. ...