The answer to 'how to maintain air duct' is to regularly clean and inspect your home's air ducts to ensure proper airflow and indoor air quality. This involves vacuuming the accessible portions of the ductwork, replacing air filters, and having a professional duct cleaning service perform a thorough cleaning every 3-5 years.
Regular maintenance helps remove dust, debris, and other contaminants that can accumulate in the ductwork over time, reducing the efficiency of your HVAC system and potentially circulating pollutants throughout your home. Proper air duct maintenance can also extend the lifespan of your HVAC equipment and improve indoor air quality.