Genuine OEM Audi Heater Inner Air Duct, part number 8R0857039A. This molded plastic component is designed to precisely direct heated air within the vehicle's interior, ensuring efficient and effective climate control. Weighing approximately 0.334 kg and measuring 0.9 meters in length, it is a critical part of the HVAC system. Using a genuine OEM air duct guarantees correct routing, optimal airflow, and durable construction, which is vital for maintaining consistent cabin temperature and preventing air leaks.