The efficiency stated for most air cleaners is purely theoretical. Internal leakage drastically reduces the actual efficiency of most air cleaners. That’s why 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.