Genuine OEM Audi Rear Air Duct, part number 4M0819811E. This component is responsible for directing conditioned airflow to specific areas within the vehicle's interior, contributing to effective climate control. It is positioned on the left rear side of the vehicle, typically as part of the rear HVAC distribution system. Weighing approximately 0.289 kg, it measures 0.54 meters in length, 0.245 meters in width, and 0.08 meters in height. Choosing a genuine OEM air duct ensures correct routing geometry, proper sealing, and durable construction for efficient and quiet air delivery throughout the cabin.