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The air flow is channeled through a central box, with piping leading to the respective outputs. There are flaps and shutters that control the directions. These usually have a foam edge to seal well, and these could be worn-out. I haven't take any newer BMW apart, so these are educated guesses.
It may just be that the flaps/shutters never were made to seal 100%.
Either way, it is usually a time-consuming job to remove the central box...
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