The Genuine BMW Heater Duct Rear Left - 51459205391 is a replacement part for the heating system in BMW vehicles. It is designed to direct warm air from the heater into the rear passenger compartment of the vehicle. This duct is made from high-quality materials and is an exact fit for the original part, ensuring proper function and longevity. It is a genuine BMW product, meaning it has been manufactured and tested to meet the high standards of the brand. This heater duct is specifically designed for the left side of the vehicle and is compatible with various BMW models.