The answer to 'how to maintain air duct' is to regularly clean and inspect your home's air ducts. This helps improve indoor air quality, extend the life of your HVAC system, and ensure proper airflow throughout your home.
Start by scheduling professional air duct cleaning every 3-5 years, or more often if you have pets, smoke indoors, or notice visible dust buildup. Between professional cleanings, you can use a vacuum hose attachment to gently remove dust and debris from the visible portions of the ductwork. Be careful not to damage the ducts. Also, check for any signs of damage or leaks and address them promptly to prevent air loss and energy waste.