Removing air duct at the bottom

NOTE: The operations shown only for one side must be carried out on both sides.

Loosen expanding rivet (1).

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: To provide a better overview: Schematic diagram with partially hidden components.
Detach the wiring harness (1) from the brackets (2).
Detach the bottom air duct (3) upwards out of the guides (4).
Guide the bottom air duct (3) downward and remove it.

Courtesy of BMW OF NORTH AMERICA, INC.