Looking for a new filter?

Need more HEPA or Carbon filters? Four ways to get hold of one:

1. Smart Air Online Store

For English, order through our online store. Payment methods include WeChat Pay, International Credit Cards and PayPal.

2. Weidian

Fast. Convenient. Pay on WeChat.

3. Taobao

If you are a WeChat user, please click the three dots in the upper right corner to “Open with Browser.” (WeChat doesn’t allow links to Taobao.)

4. Pick up in person

Pick up a filter in person from our office or one of our partners.

When should I change my HEPA?

We recommend changing your HEPAs every 140 days at about 8 hours a day, or every 1000 hours.

Click here to learn more about our HEPA longevity tests and how we calculated when to change your HEPA, or take a look at the graph below:

When should I change my carbon? 

Calculating the lifespan of a carbon is much more difficult because the primary source is from inside the home, and studies show that VOC levels in people’s home vary from almost no VOCs to many times the limit. In most cases, you can use your nose. It sounds un-scientific, but VOCs like benzene and formaldehyde are smellable even at very low levels. If you can smell that “new home smell” and have new furniture or recent remodeling, we suggest changing the carbon filter more often – as often as every 1-2 weeks.

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.