Fine white dust around vents is a frequent issue in many homes due to several potential sources. One common cause is the gradual breakdown of materials inside the HVAC system. Over time, components such as duct liners and insulation can deteriorate, releasing fine particles that circulate through the system and settle around vents.
Another contributing factor is normal household dust. As air moves through your HVAC system, it collects and redistributes tiny particles such as skin cells, fabric fibers, and debris. When these particles accumulate near vents, they can appear as a fine white powder.
2. Deteriorating Duct Liner: When Your HVAC System Is Breaking Down Internally
Deteriorating duct liner is a major source of fine white powder around vents. Duct liners are often made from fiberglass or similar materials to insulate ducts and reduce noise. Over time, age, moisture, and airflow can cause these materials to break down.
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