EN 1822-5-2009

BS EN 1822-5:2009 ICS 13.040.40; 23.120 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD High efficiency air filters (EPA, HEPA and ULPA) Part 5: Determining the efficiency of filter elements Li ce ns ed C op y: W an g Bi n, IS O /E XC HA NG E CH IN A ST AN DA RD S, 1 8/ 03 /2 01 0 06 :2 2, U nc on tro lle d Co py , (c ) B SI This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2010 © BSI 2010 ISBN 978 0 580 61794 2 Amendments/corrigenda issued since publication Date Comments BS EN 1822-5:2009 National foreword This British Standard is the UK implementation of EN 1822-5:2009. It supersedes BS EN 1822-5:2000 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee MCE/21/3, Air filters other than for air supply for I.C. engines and compressors. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Li ce ns ed C op y: W an g Bi n, IS O /E XC HA NG E CH IN A ST AN DA RD S, 1 8/ 03 /2 01 0 06 :2 2, U nc on tro lle d Co py , (c ) B SI BS EN 1822-5:2009 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 1822-5 November 2009 ICS 13.040.40 Supersedes EN 1822-5:2000 English Version High efficiency air filters (EPA, HEPA and ULPA) - Part 5: Determining the efficiency of filter elements Filtres à air à haute efficacité (EPA, HEPA et ULPA) - Partie 5: Mesure de l'efficacité de l'élément filtrant Schwebstofffilter (EPA, HEPA und ULPA) - Teil 5: Abscheidegradprüfung des Filterelements This European Standard was approved by CEN on 17 October 2009. 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 standards may be obtained on application to the CEN Management Centre or to any CEN member. 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A LI S A T I O N EUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1822-5:2009: E Li ce ns ed C op y: W an g Bi n, IS O /E XC HA NG E CH IN A ST AN DA RD S, 1 8/ 03 /2 01 0 06 :2 2, U nc on tro lle d Co py , (c ) B SI BS EN 1822-5:2009 EN 1822-5:2009 (E) 2 Contents Page Foreword ......................................................................................................................................................4� Introduction ..................................................................................................................................................5� 1� Scope ...............................................................................................................................................6� 2� Normative references .....................................................................................................................6� 3� Terms and definitions ....................................................................................................................6� 4� Description of the method .............................................................................................................7� 4.1� General ............................................................................................................................................7� 4.2� Measurement method using fixed sampling probe ....................................................................8� 4.3� Scan method ...................................................................................................................................8� 4.4� Statistical efficiency test method for EPA filters (Group E) .......................................................8� 5� Test filter ..........................................................................................................................................9� 6� Test apparatus ................................................................................................................................9� 6.1� General ............................................................................................................................................9� 6.2� Test duct ..........................................................................................................................................9� 6.2.1� Test air conditioning ......................................................................................................................9� 6.2.2� Adjustment of the volume flow rate ..............................................................................................9� 6.2.3� Measurement of the volume flow rate ..........................................................................................9� 6.2.4� Aerosol mixing section ..................................................................................................................9� 6.2.5� Test filter mounting assembly .......................................................................................................9� 6.2.6� Measuring points for the pressure drop ................................................................................... 10� 6.2.7� Sampling ....................................................................................................................................... 10� 6.3� Aerosol generation and measuring instruments ..................................................................... 11� 6.3.1� General ......................................................................................................................................... 11� 6.3.2� Apparatus for testing with a monodisperse test aerosol ........................................................ 11� 6.3.3� Apparatus for testing with a polydisperse test aerosol .......................................................... 12� 7� Conditions of the test air ............................................................................................................ 17� 8� Test procedure ............................................................................................................................. 17� 8.1� Preparatory checks ..................................................................................................................... 17� 8.2� Starting up the aerosol generator .............................................................................................. 17� 8.3� Preparation of the test filter ........................................................................................................ 17� 8.3.1� Installation of the test filter ......................................................................................................... 17� 8.3.2� Flushing the test filter ................................................................................................................. 17� 8.4� Testing .......................................................................................................................................... 18� 8.4.1� Measuring the pressure drop ..................................................................................................... 18� 8.4.2� Testing with a monodisperse test aerosol ................................................................................ 18� 8.4.3� Testing with a polydisperse test aerosol .................................................................................. 18� 9� Evaluation ..................................................................................................................................... 18� 10� Test report .................................................................................................................................... 20� 11� Maintenance and inspection of the test apparatus .................................................................. 22� Annex A (informative) Testing and classification method for filters with MPPS ≤ 0,1 µm (e.g. membrane medium filters) .......................................................................................................... 23� A.1� Background .................................................................................................................................. 23� A.2� MPPS of filters with Membrane filter medium .......................................................................... 23� A.3� Penetration consistency and uniformity of Membrane filter medium .................................... 23� Li ce ns ed C op y: W an g Bi n, IS O /E XC HA NG E CH IN A ST AN DA RD S, 1 8/ 03 /2 01 0 06 :2 2, U nc on tro lle d Co py , (c ) B SI BS EN 1822-5:2009 EN 1822-5:2009 (E) 3 A.4� Procedure for testing and classification of filters with Membrane filter media ..................... 23� A.4.1� Integral Penetration ...................................................................................................................... 23� A.4.2� Classification ................................................................................................................................ 24� A.4.3� Local Penetration ......................................................................................................................... 24� A.5� Publication of data and labelling of products with membrane filter media ........................... 24� Annex B (normative) Testing and classification of filters using media with (charged) synthetic fibers ............................................................................................................................. 26� B.1� Background ................................................................................................................................... 26� B.2� Scope ............................................................................................................................................. 26� B.3� Procedure for testing and classification of HEPA and ULPA filters using media with (charged) synthetic fibres ........................................................................................................... 26� B.4� Publication of data and labelling of products for HEPA and ULPA filters using media with (charged) synthetic fibres ................................................................................................... 27� Bibliography ............................................................................................................................................... 28� Li ce ns ed C op y: W an g Bi n, IS O /E XC HA NG E CH IN A ST AN DA RD S, 1 8/ 03 /2 01 0 06 :2 2, U nc on tro lle d Co py , (c ) B SI BS EN 1822-5:2009 EN 1822-5:2009 (E) 4 Foreword This document (EN 1822-5:2009) has been prepared by Technical Committee CEN/TC 195 “Air filters for general air cleaning”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1822-5:2000. It contains requirements, fundamental principles of testing and the marking for efficient particulate air filters (EPA), high efficiency particulate air filters (HEPA) and ultra low penetration air filters (ULPA). EN 1822, High efficiency air filters (EPA, HEPA and ULPA), consists of the following parts:  Part 1: Classification, performance testing, marking  Part 2: Aerosol production, measuring equipment, particle counting statistics  Part 3: Testing flat sheet filter media  Part 4: Determining leakage of filter element (scan method)  Part 5: Determining the efficiency of filter elements According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, 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 and the United Kingdom. Li ce ns ed C op y: W an g Bi n, IS O /E XC HA NG E CH IN A ST AN DA RD S, 1 8/ 03 /2 01 0 06 :2 2, U nc on tro lle d Co py , (c ) B SI BS EN 1822-5:2009 EN 1822-5:2009 (E) 5 Introduction As decided by CEN/TC 195, this European Standard is based on particle counting methods which actually cover most needs of different applications. The difference between this European Standard and previous national standards lies in the technique used for the determination of the integral efficiency. Instead of mass relationships, this technique is based on particle counting at the most penetrating particle size (MPPS), which is for micro-glass filter media usually in the range of 0,12 µm to 0,25 µm. This method also allows the testing test ultra low penetration air filters, which was not possible with the previous test methods because of their inadequate sensitivity. For membrane and synthetic filter media, separate rules apply, see Annexes A and B of this standard. Li ce ns ed C op y: W an g Bi n, IS O /E XC HA NG E CH IN A ST AN DA RD S, 1 8/ 03 /2 01 0 06 :2 2, U nc on tro lle d Co py , (c ) B SI BS EN 1822-5:2009 EN 1822-5:2009 (E) 6 1 Scope This European Standard applies to efficient particulate air filters (EPA), high efficiency particulate air filters (HEPA) and ultra low penetration air filters (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. It establishes 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. This part of the EN 1822 series deals with measuring the efficiency of filter elements, specifying the conditions and procedures for carrying out tests, describing a specimen test apparatus and its components, and including the method for evaluating test results. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 779:2002, Particulate air filters for general ventilation — Determination of the filtration performance EN 1822-1:2009, High efficiency air filters (EPA, HEPA and ULPA) — Part 1: Classification, performance testing, marking EN 1822-2:2009, High efficiency air filters (EPA, HEPA and ULPA) — Part 2: Aerosol production, measuring equipment, particle counting statistics EN 1822-3, High efficiency air filters (EPA, HEPA and ULPA) — Part 3: Testing flat sheet filter media EN 1822-4, High efficiency air filters (EPA, HEPA and ULPA) — Part 4: Determining leakage of filter element (scan method) EN 14799:2007, Air filters for general air cleaning — Terminology EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements (ISO 5167-1:2003) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 14799:2007 and the following apply. 3.1 sampling duration time during which the particles in the sampling volume flow are counted (upstream or downstream) 3.2 measuring procedure with fixed sampling probes determination of the integral efficiency using fixed sampling probes upstream and downstream of the test filter Li ce ns ed C op y: W an g Bi n, IS O /E XC HA NG E CH IN A ST AN DA RD S, 1 8/ 03 /2 01 0 06 :2 2, U nc on tro lle d Co py , (c ) B SI BS EN 1822-5:2009 EN 1822-5:2009 (E) 7 3.3 total particle count method particle counting method in which the overall number of particles – without size classification – can be determined in a certain test volume (e.g. by using a condensation nucleus counter) 3.4 particle counting and sizing method particle counting method which can determine both the number of particles and also their size distribution (e.g. by using an optical particle counter) 4 Description of the method 4.1 General In order to determine the efficiency of the test filter it is fixed in the test filter mounting assembly and subjected to a test air volume flow corresponding to the nominal volume flow rate. After measuring the pressure drop at the nominal volume flow rate, the filter is purged with clean air and the test aerosol produced by the aerosol generator is mixed with the prepared test air along a mixing section, so that it is spread homogeneously over the cross section of the duct. The efficiency is always determined for the most penetrating particle size (MPPS) (see EN 1822-3). The size distribution of the aerosol particles can optionally be measured using a particle size analysis system (for example a differential mobility particle sizer, DMPS). The testing can be carried out using either a monodisperse or polydisperse test aerosol. When testing with (quasi-)monodisperse aerosol the total particle counting method can be used with a condensation nucleus counter (CNC) or an optical particle counter (OPC; for example a laser particle counter). It shall be ensured that the number median particle diameter corresponds to the MPPS, i.e. the particle diameter at which the filter medium has its minimum efficiency. When using a polydisperse aerosol, an optical particle counter shall be used, which in addition to counting the particles is also able to determine their size distribution. It shall be ensured that the median diameter DM of the test aerosol lies in the range: 5,1 2 ×<> MPPSDMPPS M In order to determine the integral efficiency, representative partial flows are extracted on the upstream and downstream sides of the filter element and led to the attached particle counter to measure the number of particles