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Up to 15 times more effective than spun glass on sub micron sized particles. About twice the surface area of flat panel filters. Designed to provide allergy relief. Low air flow resistance for better equipment operation and to help save energy. Captures particles as small as 5 microns in diameter like pet dander, mold spores, ragweed, pollen, dust mites and debris.Mechanical media maintains the minimum listed efficiency through the life of the filter,Fit almost any household heating or cooling system,Reduces up to 75 percent of large airborne particles,UL classified