ISO 13348:2006 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.). ISO 13348:2006 covers the four installation categories defined in ISO 5801:A, free inlet, free outlet; B, free inlet, ducted outlet; C, ducted inlet, free outlet;D, ducted inlet, ducted outlet.