A cabin air filter helps to limit foreign particles from entering your vehicle through the heating, ventilation and air conditioning (HVAC) system. These contaminants such as dust, pollen, fungus, bacteria and exhaust gases may not bother you directly however can affect your health long term. Ryco Microshield Cabin Air Filters are developed with multiple layers, the pollen filter layer provides filtering of particles as small as 2.5 microns in size, the carbon activated layer neutralises any odours such as soot or exhaust gases and the microshield layer has anti-bacterial properties that help to guard your overall health. It is recommended that this filter is replaced every 12 months or 15,000kms.