Three-Layer Material Design Long fiber non-woven fabric: filter pollen, hair, particles, formaldehyde. Activated carbon layer: absorb peculiar smell, filter car exhaust. Acrylic coated filter paper: absorb moisture, waterproof. | High Efficiency Filtration PHILTOP air conditioning filter can quickly purify the air for you in just a few minutes, keeping the air quality index in the car around 18μg/m3. It controls the amount of dust and pollutants in the car, and provides a comfortable car interior environment for you and your family. | Original Equipment Standard PHILTOP cabin air filter has an Original Equipment standard of 29 layers of folds, filtering particles as small as 0.003 microns. 29-layers cabin air filter has a larger absorption area and longer service life. |