Borg & Beck offers standard and activated carbon references to filter 99% of harmful pollutants found in the air – It is recommended that these are replaced every year or every service, whichever comes first. If an activated carbon reference is available, this is the best choice as it will trap not only solid particles, but also harmful gases such as sulphur dioxide, nitrogen dioxide, carbon monoxide and ozone Through adsorption, activated carbon adsorbs unpleasant odours preventing them from entering the cabin, keeping the air clean and fresh All Filters are Manufactured to OE specification to ensure optimum performance and longevity. During production, all Filters are fully tested & quality checked for premium quality assurance Each reference is supplied with fitting instructions to provide a hassle-free replacement plus, they are supported by a comprehensive warranty for total peace of mind