ISO 13347-4:2004/Cor 1:2006 is a technical corrigendum to the ISO 13347-4:2004 standard, which deals with the sound intensity method for determining fan sound power levels under standardized laboratory conditions. Specifically, ISO 13347-4:2004/Cor 1:2006 corrects errors and clarifies ambiguities within the original standard. It also incorporates changes to include acoustic methods for installation category E fans and harmonizes symbols with those used in other parts of the ISO 13347 series.
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