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1、PollutionsApollutantisawastematerialthatpollutesair,waterorsoil.Airpollutioncomesfrombothnaturalandmanmadesources.Thoughgloballymanmadepollutantsfromcombustion,construction,mining,agricultureandwarfareareincreasinglysignificantintheairpollutionPollutionbegantodrawmajorpublicattentionintheUnitedState
2、sbetweenthemid-1950sandearly1970s,whenCongresspassedtheNoiseControlAct,theCleanAirAct,theCleanWaterActandtheNationEnvironmentalPolicyAct.IndoorAirContaminantsIndoorAirParticleSettlingRateMoreandmoremedicalstudieshaveimplicatedthehealthriskscausedbyfineandultrafineparticles.Thishasresultedineffortsto
3、imposemoresevererestrictionsonindustrialandtrafficemissionsinthecomingyears.Industry,traffic,andvariouscombustionprocesseshavebeenidentifiedasthemajorsourcesoffineparticles.Ofallparticles,theaccumulationsizeparticles(0.1-1mindiameter)arethosethatenterrespiratoryorgansaswellasairconditioningsystemsmo
4、steasily.Manystudieshaveimplicatedthatevenfinerparticlesthantheseposeahealthhazard.Intermsofnumberofparticles,morethan80%areultrafine,thatis,0.01-0.1mindiameter.HealthEffectsfromParticlesSizeWhenconsideringthehealtheffectsofparticles,particlesizeisthekeyfactor.Particlesmorethan10m(microns)indiameter
5、donotgetasfarasthelungs,astheyarenormallycaughtinthenasalcavityandthepharynx.Particlessmallerthan10micronsmayentertheupperrespiratorytractjustunderthepharynx,wheresomeofthemarecaughtandremoved(bycoughing,spittingorswallowing).Particlessmallerthan5micronmayenterthebronchiintheupperlungs,whileparticle
6、ssmallerthan2.5micronsmaygetdeepintothepulmonaryalveoliwherecarbondioxideinthebloodisexchangedforoxygen.Theseparticlesareextremelyhazardous,becausethehumanlunghasnoefficientmethodofremovingthem.Iftheseparticlessmallerthan2.5micronsarewater-soluble,theywillenterthebloodcirculationinamatterofminutes.I
7、ftheydonotdissolveinwater,theywillaccumulatedeepinsidethelungs.VolatileOrganicCompoundsVOCscanbeproducedbyanumberofcommonhouseholdactivitiesorincluding:*Paints,paintthinners,varnishesandothersolvents*Aerosolsprays*Airfresheners,candlesandincense*Cleaningsuppliesanddisinfectants*Storedfuelsandautomot
8、iveproducts*Hobbysupplies*Glues,adhesivesandsealingcaulks*Dry-cleanedclothing*Newcarpeting*Secondhandsmoke*Pressedwoodfurniture*Newspapers*Mothrepellants*Woodpreservatives*CookingWhatyoucantseecanhurtyou:-Youmaynotrealizeitbutyouandyourfamilycanbeexposedtothousandsofvolatileorganiccompoundsonadailyb
9、asis.VolatileOrganicCompounds(VOCs)arechemicalsthatevaporateintopotentiallyharmfulgasesatroomtemperatureandmayormaynotexudeanodor.VOCsincludeavarietyofchemicalswhichcancauseshort-andlong-termhealthproblems.BasicHVACSystemAirFilterQualityYou wanted to know about filters BUTdidnt know who to ask!6Prov
10、enAirCleaningTechnology1)PreFilter.Theairfirstentersprefilter,capturingthelargestparticles,whichenhancesthedurabilityandperformanceoftheotherfilters.2)High-EfficiencyHEPAFilter.Themosteffectivetypeofairfilteratcapturingdust,allergensandothersolidparticles(includingbacteria).HEPAfiltersarerecommended
11、bytheU.S.DepartmentofHomelandSecurity.TheS5000usesapermanent,washableHEPA,soitdoesnotrequirereplacement.3)ActivatedCarbonFilter.Thebesttypeofairfilterfortrappingchemicals,gases,odorsandcigarettesmoke.AccordingtoPennStateDept.ofAerobiologicalresearchers,carbonfiltersservetoremoveodors,volatileorganic
12、compounds(VOCs)andchemicalsthatotherfilterscannot.4)PhotocatalyticOxidationFilter.Thisfilteriscoatedwithtitaniumdioxide,whichproduceshighlyreactiveionsandelectronswhencombinedwiththeUVlightfromtheS5000sUVlamp.Thesehighlyreactiveionsattachtochemicalmolecules,bacteriaandodor-causingcompounds,destroyin
13、gthemthroughoxidation.Independenttestsbyresearchscientistshaveprovenphotocatalyticoxidationtobyhighlyeffective.5)GermicidalUVLamp.Themosteffectivewaytodestroymicro-organisms,suchasgerms,viruses,fungi(suchasmold)andbacteria.Alsodestroysmicro-organismsincludingthosethataretrappedbytheHEPAairfilter,pre
14、ventingthemfromreproducingandrecirculatingthroughtheroom.UVlampsarerecommendedbytheU.S.CentersofDiseaseControl.6)SafeandEffectiveIonizer.Circulatestrillionsofnegativeionstoneutralizefloatingpollutantsthroughouttheroom.AJournalofHygienestudyfoundnegativeionstoimproveefficiencyoffilterunits,andmultipl
15、estudies(includingthosebytheU.S.Dept.ofAgriculture)havefoundionizerstobehighlyeffectiveagainstdust,bacteria,etc.Finally,theS5000sionizerisproventobesafe,producingvirtuallynoozonewhatsoever.HEPAFilterHEPA Filter: A high efficiency particulate air (HEPA) filter is a precision high volume air filter ca
16、pable of cleaning air of all particles 0.3 micrometers in diameter or larger. HEPA filters work to clean air with microfibrous membrane materials. These Microfibersare able to cling to or block air particles that filter through the device in one of three ways.HEPA fiberglass filter media are comprised primarily of glass microfibers and are produced with a wet laid process similar to those used for the production of paper. Its an ideal raw material to produce air filters. Its efficiency ranges fr
