The cabin air microfilter for the BMW 3 Series G20 is a high-efficiency HEPA-grade filter that captures particles as small as 2.5 microns, including pollen, bacteria, fine dust and harmful exhaust particles. The activated carbon layer also neutralises odours and harmful gases entering the cabin.

1. 1
2. Open glovebox fully
3. 2
4. Remove two clips at sides of glovebox to allow it to drop down fully
5. 3
6. Locate filter housing behind glovebox
7. 4
8. Slide out old filter noting airflow direction arrow
9. 5
10. Wipe housing interior with dry cloth
11. 6
12. Insert new filter with arrow pointing toward dashboard
13. 7
14. Ensure filter seats fully with no gaps
15. 8
16. Clip glovebox back into position.