Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
A. As the air flows through the duct and outside the vent, dust is trapped and attaches itself to the duct forming a sticky residue. This sticky dirt is created by A/C moisture. Dry particles also circulate and will collect in the ductwork, thus forming “dust bunnies”. Eventually this accumulated filth will turn to mud or mildew.
