BMW Z4 sDrive28i Owner's Manual page 95

Climate Controls
Draft-free ventilation
Adjust the vents to let the air flow past you.
Microfilter/activated-charcoal filter
The microfilter traps dust and pollen in the in‐
coming air. The activated-charcoal filter pro‐
vides additional protection by filtering gaseous
pollutants from the outside air. Your service cen‐
ter replaces this combined filter during routine
maintenance.
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