We conducted tests on HEPA filters in Beijing for 200 days (7 hours a day) consecutively. After 700 hours, the HEPA filter effectiveness fell by 4% and in 1,000 hours, it fell by another 5-10%. Afterward, the effectiveness fell very quickly and by the time the 200th day came around, its effectiveness has already fallen to below 50%. If you have a effectiveness is more of a priority, change your filter every 700 hours, if cost-effectiveness is the priority, change you filter every 1,000 hours. For more information about the test we conducted, click here: https://smartairfilters.com/zh/blog/hepa-longevity-test-day-200/
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