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This International Standard specifies performance tolerances and the technical data presentation of fans of all types. It does not apply for fans designed solely for low-volume air circulation, such as those used for household or similar purposes (ceiling and table fans, extractor fans, etc.). For jet fans refer to ISO 13350. The upper limit of fan work per unit mass is normally 25 kJ/kg, corresponding to an increase of fan pressure of approximately 30 kPa for a mean density in the fan of 1,2 kg/m3. For higher values, agreement is to be reached between the supplier and the user. This International Standard embraces the five installation categories defined in ISO 5801: The performance of a fan can vary considerably with the installation category it is operating within. Therefore, these categories form an important part of the definition of the fan’s technical data presentation. The efficiency scaling procedures described in section 7.1.5 apply to centrifugal fans and axial fans within the specific speed ranges shown in Table 4. So far there is no experimental data to confirm how they should apply to mixed flow fans, having specific speeds in between.