Designation:F431−04(Reapproved2013)AnAmericanNationalStandardStandardSpecificationforAirPerformanceMeasurementPlenumChamberforVacuumCleaners1ThisstandardisissuedunderthefixeddesignationF431;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverstheacceptabledetailsandtolerancesfortheplenumchamberusedinspecifiedairperformancemeasurementtestsforvacuumcleaners.1.2Theplenumchamberisdesignedforvacuummeasure-mentsonly.(Warning—Theplenumchamberhasbeenshowntoaccuratelydeterminemaximumairpowervaluesatvarioustestpointsforvacuumcleaners.Thereisapossibilitythattheairflowvaluesmeasuredwithorificeslargerthan2in.athighflowratesmaybeerroneousduetotheproximityofthetopandbottomsurfacestotheorificeplateinlet.)1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.2.ReferencedDocuments2.1ASTMStandards:2F558TestMethodforMeasuringAirPerformanceCharac-teristicsofVacuumCleanersF820TestMethodforMeasuringAirPerformanceCharac-teristicsofCentralVacuumCleaningSystems2.2ASTMAdjunct:OrificePlateHolderDetails(F431)33.Details3.1Plenumchambersconformingtothisspecificationshallbefabricatedinaccordancewiththedimensions,tolerances,andnotesshowninthefollowingfigures:3.1.1Plenumchamberassembly,seeFig.1.3.1.2Orificeplatedetail,seeFig.2.3.1.3Orificeplateholderandassembly,seeFig.3.3.2Manometerconnectiondetail,seeFig.1(f),Note17.4.OrificePlates4.1Orificeplatesconformingtothisspecificationshallbefabricatedinaccordancetothedimensions,tolerances,andnotesshowninthefollowingfigure:4.1.1Orificeplatedimensionaldetail,seeFig.2(a).4.1.2Acceptablemachinededgesfororificeplates,seeFig.2(b).5.Keywords5.1airperformance;orificeplate;plenumchamber;vacuumcleaner1...
