... fan,indoor air will be followed through the pre-filter, electrostatic devices, triple filter(activated carbon filters, ozone filters, photocatalyst system) ... then through devices in order of pre filter, static adsorption, three-in-one filter (active carton filter, LBC system & ozone), ultraviolet tube, ... but 40% evnery saving than ordinary UV lights. 2012 new high efficiency and quality air filter