The National Air Duct Cleaners Association (NADCA) (Washington) announced the release of its latest standard, Assessment, Cleaning & Restoration of HVAC Systems, or ACR-2002. A work-in-progress for over four years, the document is now available for purchase to both members and non-members. It is the first comprehensive U.S. standard on hvac cleaning. The standard covers in greater detail topics covered in previous NADCA standards, but also addresses issues never covered before.