FilterTech FT4309 Cabin Air Filter replaces 72880-FL000 Compatible with Subaru

Cabin air filters trap foreign particles from outside air that are drawn in through your HVAC (Heating, Ventilation and Air Conditioning) system, like:

Dust particles
Allergens and pollutants
Mold spores
Bacteria
Debris

Its best to replace your cabin air filter every 12,000 miles, or if you experience any of the following:
Decreased airflow of hot or cold air
Unpleasant smell coming from vents
Overdue service interval mileage
A clean cabin air filter not only helps ensure the quality of air that you and your passengers breathe inside your vehicle, it also optimizes airflow when using the heat, defrosters or air conditioning.