ONORM EN 1822-4 : 2012

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
      3.1 sampling volume flow rate
      3.2 sampling duration
      3.3 total particle count method
      3.4 particle counting and sizing method
      3.5 particle flow rate
      3.6 particle flow distribution
4 Description of the procedure
5 Test filter
6 Test apparatus
      6.1 Set-up of the test apparatus
      6.2 Test duct
      6.3 Scanning assembly
      6.4 Aerosol generation and measurement techniques
7 Test air
8 Test procedure
      8.1 General
      8.2 Preparatory checks
      8.3 Starting up the aerosol generator
      8.4 Preparing the test filter
      8.5 Testing
9 Evaluation
      9.1 Calculating the penetration and the efficiency
      9.2 Local penetration
      9.3 Mean efficiency
      9.4 Classification
10 Test report
      10.1 Details of the test filter
      10.2 General details of the test parameters
      10.3 Test results
11 Maintenance and inspection of the test apparatus
Annex A (normative) Oil thread test
Annex B (normative) Determining the test parameters
Annex C (informative) Example of an application with
                      evaluation
Bibliography

Applicable to high efficiency air filters and ultra low penetration air filters (HEPA- and ULPA-filters) for use in the field of air conditioning and ventilation and for the technical processes, e.g. for clean room technology or applications in the nuclear or pharmaceutical industry. It gives a method for determining 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.