BMW Genuine Cabin Air Pollen Filter/Microfilter

Ridged and narrow, the Genuine BMW microfilter vastly reduces the concentration of contaminants and dirt particles in the car's interior, making the air you breathe inside the car up to eight times purer than the air outside

Fed through a water-repellent and chemical-resistant plastic polypropylene fleece, the air is filtered by combined mechanical and electrostatic means.

Despite its compact external dimensions, the fleece contains a staggering total average of 200,000 square metres in surface area, the equivalent of a 5mm wide strip going right around the Earth.

For vehicles with Automatic air conditioning (S534A).
Represented by part number 1 in the diagram.