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For every visible particle trapped in your furnace filter such as dust, dirt and mold, there are as many as 100 more that you cannot see, including bacteria, fungi and pollen. If not stopped these microparticales can seep through your HVAC system and back into your air. Through independent lab testing, DuPont filters have been proven to trap a greater percentage of microparticales than conventional fiberglass filters. This filter utilizes state-of-the-art technologies in odor control. The filtration media incorporates an antimicrobial protection to prohibit growth of odor causing microbes on the surface of the filter pad itself as well as Oguard additives which have been shown in controlled laboratory tests to have efficacy on a broad range of household odors. DuPont filters are manufactured in the USA.