Azen Anti-Germ Air Sterilizer operates on a high efficient filter system. Pre-filtering is the first stage of the filtering process in the air sterilizer unit. This unique design maximizes media usage which results in a more gradual rise in resistance and higher dust loading capacity. It provides a higher gross media area that is practically 5 times larger than what is commonly available in rival air sterilizers in the market. The pre-filters are constructed and designed to be robust and sturdy. Thus, they do not degrade under harsh operating conditions.