ANSI/AMCA 205-12
This standard defines the classification for all fan types designed to be driven by motors of nominal rating 125 W (1/6 hp) and above. The fans can range from the purpose built single fan to series produced fans manufactured in large quantities. This standard applies to the fan and not the fan system. This standard excludes classification for circulating fans.
This standard can be also be used by legislative or regulatory bodies for defining the energy efficiency requirements of fans used in specific applications.