Assessment, Cleaning, and Restoration of HVAC Systems (ACR The NADCA Standard) is unique in that it is a performance standard that also provides minimum procedural requirements. This Standard has evolved from procedural-based guidelines, standards of care, and research originating from the National Air Duct
Cleaners Association (NADCA), along with associated organizations. It is based on reliable principles, review of applicable industry literature and information, and practical experience.
This Standard establishes minimum performance requirements for assessing new and existing HVAC systems, evaluating the cleanliness of HVAC system components, determining the need to clean and cleaning and restoring systems to a verifiable cleanliness level. The Standard also focuses on preventing
job-related hazards, such as exposure to workers and occupants, and cross-contamination to the indoor environment.
This document is written for use by those involved in the HVAC cleaning and restoration industry including specifiers, consultants, contractors and end users. Users of this document should stay updated and informed about changes in the industry and implement changes in technology and procedures, as appropriate, while following applicable federal, state, provincial, and local laws and regulations.

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