Fans for general purposes. Tolerances, methods of conversion and technical data presentation algolia-search-ignore A series of screening levels

A series of screening levels (1 to 5) is defined in terms of progressively more complex screening measures

A testing procedure based upon:

and the preparation of a bulk test sample from this

Trace elements (or trace metals) are minerals present in living tissues in small amounts

Fans for general purposes. Tolerances, methods of conversion and technical data presentation algolia-search-ignore A series of screening levels1 Scope This International Standard specifies performance tolerances and the technical data presentation of industrial 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 kg1, corresponding to an increase of fan