Filters outside air that enters the passenger compartment through the heating, ventilation and air-conditioning systems Removes up to 90% of dust, pollen and spore particles larger than three microns (a grain of beach sand is about 200 microns) Should be replaced every 15,000 miles or once each year – more often in especially dusty or polluted conditions Available for all Ford, Lincoln and Mercury vehicles equipped with a Cabin Air Filtration System