NEN EN 13487 : 2004

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Instrumentation
5 Manufacturer's data
6 Test conditions
   6.1 Test methods
   6.2 Operating condition of the test subject
   6.3 Ambient condition
   6.4 Arrangement of measuring points
       6.4.1 General
       6.4.2 Apparatus with vertical air throw and draw
             through arrangement
       6.4.3 Apparatus with horizontal air throw and draw
             through arrangement
       6.4.4 Special apparatus
7 Test procedures
   7.1 Measurement of sound pressure/intensity levels
   7.2 Measurement of the background noise
   7.3 Data to be recorded
8 Calculations
   8.1 Correction value for the background noise
   8.2 Correction value for the influence of the ambient
   8.3 Calculation of sound data
       8.3.1 A-weighted sound power level
       8.3.2 Average sound pressure level on the partial
             measuring areas a to e
       8.3.3 Sound power level of the test subject
9 Conversion to nominal fan speed
10 Test report
Annex A (normative) Positions of measuring points
        for vertical air throw
  A.1 Example with one fan
  A.2 Example with six fans
Annex B (normative) Positions of measuring points for
        horizontal air throw
  B.1 Example with one fan
  B.2 Example with six fans
Annex C (normative) Standard method for calculating the
        sound pressure level
Annex D (normative) Deviations from the test subject
  D.1 Model ranges composed of modules
  D.2 Dimensions of the heat exchanger coil
Annex E (informative) Directivity
  E.1 General
  E.2 Definition
  E.3 Calculation of the directivity number
Bibliography

Provides methods for uniform assessment and the recording of: - the A-weighted sound power level; - the sound power spectrum; - a calculation method for an overall average sound pressure level at a given distance.