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Cleaning Heating, Ventilation, and Air Conditioning (HVAC) systems is a precise technical process that goes beyond surface dusting. To ensure indoor air quality and system efficiency, the National Air Duct Cleaners Association (NADCA) established a global benchmark known as ACR: The NADCA Standard, which defines the professional framework for assessing, cleaning, and restoring these systems. Air duct cleaning should follow a procedure based on the NADCA ACR Standard (Assessme