This standard provides a method for predicting sound pressure levels based on the ISO 9613-2 standard for propagation of sound outdoors utilizing the apparent wind turbine model-specific sound power level determined in accordance with International Electrotechnical Commission (IEC) 61400-11 for the downwind location. The Download button above will direct you to the American National Standards Institute webstore where you will be able to complete your purchase. Disclaimer: This document is proprietary and its use is subject to a legally binding license agreement and disclaimer (the “Agreement”) which can be found online here, as it may be updated from time to time.