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H13 True HEPA – Superior to standard true H11 HEPA filters, H13 HEPA filters 99.97% of particles down to 0.3 microns and 99.95% of particles between 0.3 – 0.1 microns. These smaller particles make up most harmful airborne pollutants like smoke and lead dust. Improved carbon filter – Our activated carbon filter features more carbon than other carbon filters on the market and microporous zeolite for improved performance. Designed for greater surface area absorption, our unique honey-comb carbon filter can target more odors, gases, and smoke while lasting much longer. 4 stages of filtration – Our 4-stage HEPA filter features a Polypropylene Pre-Filter, H13 True HEPA Filter, Activated Carbon Filter, and a Cold Catalyst Filter. Together, the filter targets all common air pollutants such as pollen, pet dander, VOC’s, smoke, and odors.