All Wesfil Cabin Filters are carbon activated with Nano technology. The carbon filtering removes harmful contaminants and impurities such as toxic gases and odours. The Nano technology removes solid particulates such as dust, pollen, mould and bacteria from the air. These particulates can significantly impact the functioning of your air conditioning system.The Wesfil Cabin Filter with Nano technology offers reliable and longlasting premium protection for your passengers as well as your air conditioning system.