ISO 13347-3:2004/Amd 1:2010

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SO 13347-3:2004/Amd 1:2010 is an International Standard for industrial fans, specifically addressing the determination of fan sound power levels under standardized laboratory conditions using the enveloping surface method. The "Amd 1:2010" part signifies an amendment or correction to the original 2004 standard, indicating some changes or clarifications were made in 2010.