Air ducts are passages used in heating, ventilation, and air conditioning (HVAC) systems to distribute air throughout a building. They help maintain a comfortable indoor environment by delivering warm or cool air to different rooms. Properly designed air ducts ensure efficient airflow and temperature control. These ducts can be made from various materials, including metal, fiberglass, or flexible plastic. Regular maintenance, such as cleaning and sealing, is essential to prevent dust buildup and ensure optimal performance. Well-maintained air ducts contribute to better air quality and energy efficiency in homes and commercial spaces.