BS 848-9:2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Performance tolerances for purpose-designed fans
  and series-produced non-certified fans
  5.1 Information to be provided by the purchaser
  5.2 Information to be provided by the supplier
  5.3 Tolerances
  5.4 Purchasing arrangements
  5.5 Contractual testing
6 Performance tolerances for series-produced fans
  in certified ratings programmes
  6.1 General
  6.2 Fan laws
  6.3 Check-tests
  6.4 Air performance tolerances
  6.5 Sound tolerances
7 Methods of conversion
  7.1 Conversion of air performance test data
  7.2 Conversion of sound power test data
8 Technical data presentation
  8.1 General
  8.2 Essential information
  8.3 Fan performance chart
  8.4 Additional information
Annex A (normative) Documentation
Annex B (normative) Marking
Annex C (informative) System resistance as a function
                      of flowrate
Bibliography

Specifies performance tolerances and the technical data presentation of industrial fans of all types.

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 kg^-1, corresponding to an increase of fan pressure of approximately 30 kPa for a mean density in the fan of 1,2 kg m^-3. For higher values, agreement is to be reached between the supplier and the user.

This International Standard embraces the four 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.

NOTE International acceptance of the four installation categories provides the opportunity to base a contract on the most appropriate fan category for the end user and the system designer. Correspondingly, the likelihood of the fan providing the agreed performance, without compromise or concession, is enhanced.