BMW E81 E87 Rear Ventilation Boot Vent Cassette Filter Cover Panel 6900748

The BMW E46 E81 E87 E88 Rear Air Vent Grille is an original body part from the Cladding, Decorative Strips, and Decorations group, designed for installation in the rear of the vehicle. It ensures controlled airflow from the cabin to the outside, supporting proper interior ventilation and stable pressure within the BMW body.

Specifications and technical data

• SKU: 6905748-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6900748
• Substitutable numbers: 64226900748, 6900748, BG
• Location on the vehicle: Rear
• Category: Other Interior Parts & Accessories

Purpose and Function of the Air Vent Grille

The air vent grille, mounted at the rear of the BMW E46, E81, E87, and E88 body, is responsible for expelling air from the cabin when doors are closed, the ventilation system is operating, and during pressure changes inside the vehicle. A properly functioning air vent:

• stabilizes cabin pressure at higher speeds,
• reduces the "air rebound" effect when closing doors,
• supports the efficient operation of the ventilation and heating system,
• helps maintain acoustic comfort inside.

Its placement at the rear of the body allows for discreet air expulsion without compromising the vehicle's styling.

Construction and Fit for BMW

The offered part is a factory BMW solution, specifically designed for the indicated model generations. This ensures the grille has an appropriately selected shape, profile, and mounting points, which translates to:

• secure seating in the body opening without stress,
• proper adhesion to the sheet metal surface,
• maintaining a seal in the mounting area,
• consistency with the original ventilation system design.

Precise fitting to the specific BMW platform reduces the risk of incorrect installation and eliminates the need for body modifications.

Benefits of Using an Original Air Vent

Using an original rear air vent grille on a BMW vehicle offers tangible operational benefits:

• Stable Ventilation System Operation – cabin air has a manufacturer-intended exit path.
• Improved User Comfort – reduced excessive air resistance when closing doors and improved circulation.
• Consistency with Body Construction – the part works in conjunction with factory seals and cladding.
• Hassle-Free Installation – the air vent is ready for installation in its designated rear vehicle location.

This solution is particularly recommended for post-accident repairs, replacement of corroded body parts, or restoring a vehicle to its original factory specifications.

Condition, Origin, and Service Application

This part comes from the BMW offering and is intended for reinstallation in vehicles where the original rear air vent needs replacement. It is suitable for professional body and paint shops as well as workshops specializing in the BMW brand, where adherence to original body construction and predictable long-term performance are crucial.

Fitment by Numbers and Additional Technical Information

To ensure you select the correct air vent for your specific BMW, it is advisable to use the manufacturer's designations and interchangeable part numbers assigned to this reference. This allows you to verify compatibility with the specific body version, model year, and equipment variant, which is particularly important when working with the E46, E81, E87, and E88 platforms.

If you need other body parts related to trim and decoration for this brand, check the available parts in the BMW Cladding, Decorative Strips, and Decorations category.

To better understand the importance of using original used components in cars of this brand and the procedures for selecting parts by manufacturer numbers, it is worth reading the article BMW – Sporty Performance and Precision. How Original Used Parts Extend the Life of the Bavarian Icon?.