The Genuine BMW Rear Heater Duct - 64229207333 is a part used in BMW vehicles to direct heated air from the rear heating system to the back of the vehicle. It is a genuine OEM (original equipment manufacturer) part, meaning it is made by the same company that produces BMW vehicles. This rear heater duct is designed specifically for BMW models and is made with high-quality materials to ensure durability and proper functioning. It is an essential component for maintaining a comfortable temperature in the back of the vehicle during colder weather.