guide Questions and Answers
ACRA(Assessment,ACleaning,AandARestorationAofAHVACASystems)A-
AAnswerAuniqueAinAthatAitAisAaAperformanceAstandardAthatAalsoAprovidesAmin
imumAproceduralArequirementsA.AThisAStandardAhasAevolvedAfromAprocedural-
basedAguidelines,AstandardsAofAcare,AandAresearchAoriginatingAfromAtheANatio
nalAAirADuctACleanersAAssociationA(NADCA),AalongAwithAassociatedAorganization
sA.AItAisAbasedAonAreliableAprinciples,AreviewAofAapplicableAindustryAliterature
AandAinformation,AandApracticalAexperienceA.
ACRA(Assessment,ACleaning,AandARestorationAofAHVACASystems)A-
AAnswerAThisAStandardAestablishesAminimumAperformanceArequirementsAforAas
sessingAnewAandAexistingAHVACAsystems,AevaluatingAtheAcleanlinessAofAHVACA
systemAcomponents,AdeterminingAtheAneedAtoAcleanAandAcleaningAandArestorin
gAsystemsAtoAaAverifiableAcleanlinessAlevelA.ATheAStandardAalsoAfocusesAonApr
eventingAjob-
relatedAhazards,AsuchAasAexposureAtoAworkersAandAoccupants,AandAcross-
contaminationAtoAtheAindoorAenvironmentA.
ACRA(Assessment,ACleaning,AandARestorationAofAHVACASystems)A-
AAnswerAThisAdocumentAisAwrittenAforAuseAbyAthoseAinvolvedAinAtheAHVACAcle
aningAandArestorationAindustryAincludingAspecifiers,Aconsultants,AcontractorsAan
dAendAusersA.AUsersAofAthisAdocumentAshouldAstayAupdatedAandAinformedAabo
utAchangesAinAtheAindustryAandAimplementAchangesAinAtechnologyAandAproced
ures,AasAappropriate,AwhileAfollowingAapplicableAfederal,Astate,Aprovincial,Aan
dAlocalAlawsAandAregulationsA.
ACRA(Assessment,ACleaning,AandARestorationAofAHVACASystems)A-
AAnswerAAllAHVACAcleaningAandArestorationAprojectsAareAuniqueAand,AinAcerta
inAcircumstances,AcommonAsense,Aexperience,AandAprofessionalAjudgmentAmayAj
ustifyAdeviationAfromAthisAStandardA.AItAisAtheAresponsibilityAofAtheAcontractor
,AorAothersArelyingAonAthisAStandard,AtoAverifyAonAaAcase-by-
caseAbasis,AthatAapplicationAofAthisAStandardAisAappropriateA.AWhenAinAdoubt,
AuseAcautionAandAseekAadditionalAprofessionalAguidanceA.AUsersAofAthisAdocu
mentAassumeAallArisksAandAliabilitiesAresultingAfromAuseAof,AandArelianceAupo
n,AthisAStandardA.