Manufacture, design and develop indoor and outdoor shooting range acoustic designs to meet OSHA, local noise ordinances, ETL and USACE standards. The patented Troy System has the highest noise absorption to assure a 1.25 second reverb time across all octaves from 125 Hz to 8000 Hz. This system, which is comprised of one layer of Portland Cement cementious wood fiber board and a layer of Troy Wool, is US Air Force approved for anti-ricochet and anti-splatter for errant 5.56 and 7.62 rounds.This allows the replacement of two layers of plywood. (less)