How Often Are the Filters to Be Replaced?

We used the DIY’s HEPA filter lifespan to determine the lifespan of the HEPA filter. If the Blast Mini is used for 8 hours everyday in an 80m² room on the lowest level, the filter can be used for 13 months (or 3,120 hours). If it is used on the highest level, it can last for 12 months (or 2,880 hours).
If the Blast is used for 8 hours everyday in a 130m² room on the lowest level, the filter can be used for 22 months (or 5,280 hours). If it is used on the highest level, it can last for 19 months (or 4,560 hours). Do determine its lifespan based on usage.

Here’s the test results from the lifespan tests we conducted in Beijing: https://smartairfilters.com/zh/blog/hepa-longevity-test-day-200/
Some big purifier companies claim that their HEPA lifespans are the same no matter which country you are in, but how can it be the same when the air quality differs so greatly in different parts of the world?

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