Go ahead—shout for joy. With Extra Microperforated MetalWorks ceiling panels in place, no one will hear you. Uninsulated, unperforated panels have a noise-reduction coefficient rating of .65. Add insulation to perforated panels, and the NRC rises to .90. 2500 Columbia Avenue, P.O. Box 3001, Lancaster, PA 17604; 877-276-7876; armstrong.com.