NEN EN 1822-3 : 2009

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

Defines a procedure for the determination of the efficiency on the basis of a particle counting method using a liquid test aerosol, and allows a standardized classification of these filters in terms of their efficiency. Applies to high efficiency particulate air filters and ultra low penetration air filters (EPA, HEPA and ULPA) used in the field of ventilation and air conditioning and for technical processes, e.g. for applications in clean room technology or pharmaceutical industry.