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1、BSEN779:2012BSIStandardsPublicationParticulateairfiltersforgeneralventilation—Determinationofthefiltrationperformance--``,`,`,`,,``,````,`,`,,,,,,`,-`-`,,`,,`,`,,`---NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAW?raisingstandardsworldwideCopyrig
2、htBritishStandardsInstitutionProvidedbyIHSunderlicensewithBSI-UncontrolledCopyLicensee=HongKongPolytechnicUniversity/9976803100NoreproductionornetworkingpermittedwithoutlicensefromIHSNotforResale,04/25/201223:52:03MDTBSEN779:2012BRITISHSTANDARDNationalforewor
3、dThisBritishStandardistheUKimplementationofEN779:2012.ItsupersedesBSEN779:2002whichiswithdrawn.BSEN779:2012providesasystemofcheckingthefiltrationperformanceofairfiltersusedinairconditioningsystems.TheuseofthisrevisedversionofBSEN779willensureamorerigorouschec
4、kofthequalityandperformanceofairfiltersusedinairconditioningsystems.Thisinturnwillresultinimprovedairqualityinindoorworkingenvironments.Thetestproceduresusedinthisstandardarebasedonestablishedtechniquesdevelopedoverdecades,butusingmoderndigitalinstrumentation
5、.Themultiplemechanismsinvolvedinairfiltrationarecomplexanddifficulttomodel,andconsequentlythetestingtechniquesthemselveshavealsobecomecomplex.Aresultofthisisthattheperformancegradingofairfilterscannotbecarriedoutreproduciblyintermsoftheireffectivenessintherem
6、ovalofatmosphericparticulateairpollution.Testsusingartificial(synthetic)particulatecontaminationareusedtogradethesefilters.TheBSEN779:2012testsystemgrades(ranks)airfiltersaccordingtotheirparticulateremovalcapability.Thisvariesandmayincreaseordecreasesignifica
7、ntlyduringthelifetimeofthefilter.Usersofthisstandardneedtobeawarethattheterm'averageefficiency',whichoccursintheclassificationtableandinotherplaces,isatestparameterthatrelatesonlytotestsusingartificialtestcontaminationinartificialtestconditions.Thevalueofthis
8、parameterobtainedinthetestproceduresdoesnotcorrespondwithorrelatedirectlytotheinstalledperformanceofairfiltersinventilationsystems.Thisvaluecannotbeusedtoestimateorpredicttheeffectiveness
