What does NADCA stand for?

The correct answer is that NADCA stands for the National Air Duct Cleaners Association. This organization is dedicated to promoting the highest standards of professional duct cleaning services. NADCA establishes guidelines for air duct cleaning professionals and provides training and certification for those in the industry. Their focus is on improving indoor air quality and ensuring that duct cleaning methods are performed safely and effectively.

The other options presented do not accurately describe NADCA. They either use variations of the name that do not correspond to any known organization or they refer to unrelated activities. Understanding the proper name and its implications helps in recognizing the significance of professional associations in ensuring industry standards and practices.