Various other Standards bodies throughout the world have also published fan test Codes. These are not necessarily of the same technical merit. In a global economy, where fans of various nations and manufacturers compete regularly, this can present problems where comparisons have to be made. It is almost impossible to make such comparisons where technical catalogues present data from tests to different national Codes.
In 1997 the first international Standard was published — ISO 5801 — and it is strongly recommended that this should be used in all competitive situations, both in customers, specifications and for acceptance tests. Even this is not enough. Many alternative methods are detailed in the Standard, which may give slightly different results. Preferably the same method should also be used for an appropriate installation category (See Section 4.4)
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