The HEPA filters for the QT3 air purifier should last approximately 800 hours, or 3 months when run for 8 hours per day. After this amount of time, the ‘filter replacement indicator‘ will begin to flash on the QT3.
We calculated the number ‘800 hours’ assuming the QT3 is run on high, in Beijing (annual PM2.5 levels of approximately 40 micrograms). To find out how this number might vary for you where you live, use our HEPA lifespan calculator and input your country.
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