【正文】 This European Standard was approved by CEN on 1 October 2022. CEN members are bound to ply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standards may be obtained on application to the 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C OM I T201。E N D E NOR M AL I S ATI ON EUR OP 196。R NOR M UNG Management Centre: rue de Stassart, 36 B1050 Brussels 169。 BSI Contents page Foreword ......................................................................................................................................................................3 Introduction .................................................................................................................................................................4 1 Scope ..............................................................................................................................................................5 2 Normative references ....................................................................................................................................5 3 Terms and definitions....................................................................................................................................5 plane of sash ..................................................................................................................................................5 inner measurement plane .............................................................................................................................5 containment factor (CF) .................................................................................................................................6 4 Test room and general test conditions........................................................................................................6 Dimensions and construction ......................................................................................................................6 Test room conditions ....................................................................................................................................6 Fume cupboard installation ..........................................................................................................................6 Test conditions ..............................................................................................................................................6 5 Air flow tests...................................................................................................................................................7 Extract volume flow rate ...............................................................................................................................7 Face velocity...................................................................................................................................................7 Containment ...................................................................................................................................................8 Robustness of containment........................................................................................................................14 Air exchange efficiency ...............................................................................................................................15 Pressure drop...............................................................................................................................................17 6 Sash tests .....................................................................................................................................................17 Sash suspension test ..................................................................................................................................17 Sash displacement test ...............................................................................................................................18 Protection against splashes .......................................................................................................................18 Sash stop and alarm test ............................................................................................................................18 7 Air flow indicator tests ................................................................................................................................18 8 Construction and materials tests ...............................................................................................................18 9 Illuminance test ............................................................................................................................................18 10 Test report ....................................................................................................................................................18