For more than 30 years, the Custom Window by Wausau 8300 and 9250 Series have helped achieve modern performance and preserve the look of landmark buildings. As part of its continual product improvement, Wausau recently updated and enhanced these aluminum windows. Verifying their functionality and reliability, these products were tested and recertified to meet AW Architectural Performance Class requirements set by the North American Fenestration Standard AAMA/WDMA/CSA 101/I.S.2/A440-11 (NAFS). The standard includes stringent criteria for air, water and structural performance. In addition, Wausau expanded the available battery of test reports on these products to include acoustic performance, thermal transmittance and condensation resistance, which are key considerations in modernization projects.