With Noise Reduction Coefficient (NRC) up to 0.95 and Articulation Class (AC) rating of 190, Rockfon® Sonar™ stone wool ceiling panels improve acoustics in open-plan offices and other commercial interiors while also supporting speech privacy. White surface delivers 0.85 LR (light reflectance), and product exhibits dimensional stability at up to 100% RH. At 1 in. thick, panels install in 9/16 and 15/16 in. ceiling suspension systems or can be directly applied to sound-reflecting surface.