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HEPA filters capture particulate pollution like PM2.5, allergens, bacteria and viruses and are the key to clean air. This is the r eplacement HEPA E11 filter for the QT3 portable air purifier . Enjoy worry-free clean air wherever you go! Smart Air recommends changing the filter after 1200 hours of use. The QT3 has a built-in feature to remind you when 1200 hours of use have passed.
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