EN 779 EUROPEAN STANDARD NORME EUROPEENNE EUROPAISCHE NORM April 2012 ICS 91.140.30 Supersedes EN 779:2002 English Version Particulate air filters for general ventilation - Determination of the filtration performance Filtres a air de ventilation generale pour I'elimination des Partikel-Luftfilter fur die allgemeine Raumlufttechnik - particules - Détermination des performances de filtration Bestimmung der Filterleistung This European Standard was approved by CEN on 14 April 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels @ 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 779:2012: E worldwide for CEN national Members. EN 779:2012 (E) Contents Foreword... .4 Introduction .. 1 Scope . 2 Normative references ... 3 Terms and definitions . 4 Symbols and abbreviated terms ... ...11 5 Requirements ... .12 6 Classification.. .14 7 Test rig and equipment ... .15 7.1 Test conditions ... 15 7.2 7.3 Aerosol generation - DEHs Test Aerosol.... .17 7.4 Aerosol sampling system . 7.5 Flow measurement .. 19 7.6 Particle counter.... 7.7 Differential pressure measuring equipment 19 7.8 Dust feeder ... 19 8 Qualification of test rig and apparatus.... .23 8.1 Air velocity uniformity in the test duct ..... .23 8.2 8.3 Particle counter sizing accuracy.. .24 8.4 Particle counter zero test. .25 8.5 Particle counter overload test ... 8.6 100 % efficiency test... .25 8.7 Zero % efficiency test.. 25 8.8 Aerosol generator response time 26 8.9 8.10 Pressure drop checking... .26 8.11 Dust feeder air flow rate.... 26 8.12 Summary of qualification requirements ..... 8.13 Apparatus maintenance ....... 9 9.1 Test air - cleanliness, temperature and humidity... .28 9.2 Test aerosol. 28 9.3 Loading dust .29 9.4 Final filter 10 Test procedure for the filter... .30 10.1 Preparation of filter to be tested .30 Initial pressure drop 10.2 .30 10.3 10.3.1 General.... .30 30 10.3.2 Efficiency measurement , 10.4 Dust loading procedure .... 10.4.1 10.4.2 Arrestance 32 10.4.3 Efficiency 33 10.4.4 Average efficiency . 10.4.5 Test dust capacity.. 33 2 EN 779:2012 (E) 11 Test method for discharging of filter material.. 11.1 General.. 34 11.2 Equipment 34 Preparation of test samples ..... 11.3 Measurement of the filter medium efficiency 11.4 .35 11.4.1 General... .35 11.4.2 11.4.3 Expression of results ... 11.5 Report ... .36 12 Uncertainty calculation of the test results ... 37 13 Reporting ... 13.1 General... 38 13.2 Interpretation of test reports .. 13.3 Summary 13.4 Efficiency .... 41 Pressure drop and air flow rate. 13.5 41 13.6 Arrestance and test dust capacity 13.7 Marking ... 42 Annex A (informative) Shedding from filters. .51 A.1 General.. 51 A.2 Shedding . 51 Particle bounce .. A.2.1 A.2.2 Release of fibres or particulate matter from filter material .. 51 A.2.3 Re-entrainment of particles ... 51 A.3 A.4 References .52 Annex B (informative) Commentary ..53 B.1 General 53 Classification B.2 53 B.3 B.3.1 Test aerosol