Turbine Centrifugal Fan: This device is equipped with a Turbine fans & these move a lot more air in small spaces when compared to a conventional fan blade design. AIRPURE 3-Layer Filtration: Stage 1: Pre-Filter Stage 2: HEPA Filter H11 Stage 3: Activated Carbon Filter AP 1.0 AIRPURE Car Air Purifiers feature a powerful, efficient and fast-acting air filtration system. The unique 3-stage SelectFilter Plus removes up to 125 harmful pollutants and exhaust gases, through its HEPA and HESA layers. Independently certified by Airmid Healthgroup, the SelectFilter Plus technology also removes up to 90% of airborne pollen allergens. Activated Carbon Filter: The activated carbon layer is the final filter for the air purification process. This carbon filter is comprised of small pieces of carbon in the form of a powdered block that traps hazardous compounds such as dust mites, smoke, pet danders and molds. Odors and Volatile Organic Compounds (VOC) that are present in the atmosphere such as polymers, foam, upholstery, adhesive, carpet, coating and composite will also be removed through the activated carbon filters, leaving behind fresh and cleaner air to breathe.