The efficiency stated for most air cleaners is purely theoretical. Internal leakage drastically reduces the actual efficiency of most air cleaners. IQAir systems feature patented triple-sealing technology. First, a unique process ensures that the filter media is 100% sealed in the filter frame. Second, IQAir’s patented 3D UltraSeal ensures perfect knife-edge-in-groove sealing between filter frame and housing. Third, individual seals on each housing module ensure an airtight housing. As a result, IQAir systems have a total system efficiency that is higher than the theoretical efficiency of conventional air cleaners.