CONTINUOUS SOUND ABSORBING PERFORATIONS FOR A MONOLITHIC APPEARANCE Product Details: Perforation: 12mm/20mm/66mm o.c. Panel Thickness: 1/2″, 12.5mm Non-Woven Fabric: Charcoal Gray Open Rate: 19.6% NRC: Up to .85 Board Sizes: 1188 mm x 1980 mm 924 mm x 2706 mm Product Data Sheet: Sonus Composite 12-20/66