NBN EN 1822-3 : 2010

Foreword
1 Scope
2 Normative references
3 Definitions and quantities
4 Description of the test method
5 Sampling of sheet filter media
6 Test apparatus
    6.1 Test arrangements for testing with monodisperse
          test aerosol
    6.2 Test arrangements for testing with a polydisperse
          test aerosol
    6.3 Test filter mounting assembly
    6.4 Determination of the filter medium face velocity
7 Requirements for the test air
8 Testing procedure
    8.1 Preparatory checks
    8.2 Procedure
    8.3 Reference test method
9 Evaluation
10 Test report
11 Maintenance and inspection of the test apparatus
Annex A (informative) Example of an application with
evaluation
 

Applicable to high efficiency particulate air filters and ultra low penetration air filters (HEPA and ULPA) used for ventilation and air conditioning and technical processes, such as for clean room technology or applications in the nuclear and pharmaceutical industry. Gives a method for determining the efficiency on the basis of a particle counting procedure which uses a liquid test aerosol, and permits a standardized classification of these filters in terms of their efficiency.