Designation:D6245−18StandardGuideforUsingIndoorCarbonDioxideConcentrationstoEvaluateIndoorAirQualityandVentilation1ThisstandardisissuedunderthefixeddesignationD6245;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidedescribeshowmeasuredvaluesofindoorcarbondioxide(CO2)concentrationscanbeusedinevalua-tionsofindoorairqualityandbuildingventilation.1.2ThisguidedescribesthedeterminationofCO2genera-tionratesfrompeopleasafunctionofbodysizeandlevelofphysicalactivity.1.3Thisguidedescribestheexperimentally-determinedre-lationshipbetweenCO2concentrationsandtheacceptabilityofaspaceintermsofhumanbodyodor.1.4ThisguidedescribesthefollowingusesofindoorCO2concentrationstoevaluatebuildingventilation–massbalanceanalysistodeterminethepercentoutdoorairintakeatanairhandler,thetracergasdecaytechniquetoestimatewholebuildingairchangerates,andtheconstantinjectiontracergastechniqueatequilibriumtoestimatewholebuildingairchangerates.1.5ThisguidediscussestheuseofcontinuousmonitoringofindoorandoutdoorCO2concentrationsasameansofevaluatingbuildingventilationandindoorairquality.1.6Thisguidediscussessomeconcentrationmeasurementissues,butitdoesnotincludeorrecommendamethodformeasuringCO2concentrations.1.7ThisguidedoesnotaddresstheuseofindoorCO2tocontroloutdoorairintakerates.1.8Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.9Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.10Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrincipl...
