How Often Should the Filters to Be Replaced in my Air Purifier?

Smart Air purifiers can contain both HEPA and carbon filters. The lifespan of each varies with usage and the purifier.

When Should I Replace the HEPA filters in my Smart Air Purifier?

The HEPA filter lifespan varies for each purifier. For an up-to-date list of each of our air purifier’s HEPA filter lifespans, check out our air purifier overview and manuals page.

How long do the carbon filters last in my Smart Air purifier?

Learn more: how long do carbon filters last, and when do they need replacing? 

What Else Should I Know Before Replacing My HEPA Filter?

Many purifier companies give just a single number for the lifespan of HEPA and carbon filters. However, in reality, the true lifespan of each filter will depend on where the purifier it used, how long it is run for, and how dirty the air is where the purifier is running.

We don’t like these standard numbers most companies give. That’s why we make sure to run real-world tests on all our purifiers, and provide explanations on how to adjust the numbers for where you live.

For example, 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.

Learn more: How we tested our air purifiers in real-world air over 200 days to determine HEPA filter lifespan »


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Smart Air is a social enterprise that creates simple, no-nonsense air purifier and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.