5.00 out of 5
(1 customer review)


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HEPA filters are what trap small particles like PM2.5, soot and pollen. They’re a technology that was invented over 80 years ago and they’re not expensive! We’ve thrown out the marketing hype other companies use, and provide a simple, effective no-nonsense HEPA filter that can capture over 99.5% of all particles to get you breathing safe.

This HEPA filter is suitable for the DIY1.1 air purifier.

Your Purchase Includes 1 × DIY1.1 HEPA Filter
Type H12 (99.5%)
Colour White with black rim
Lifespan (hours) 1000
Dimensions L × W × H (cm) 30 × 2 × 30

H12 HEPA filter – filters out 99.5% of all particles

HEPA filters (or High efficiency particulate air) are filters that capture at least 95% of particles. The ones we use capture 99.5% of particles, including the really tiny ones.

HEPA Filter PM2.5 pollen viruses mold bacteria

How often should I change the HEPA filter?

We recommend replacing your filter after 140 days of use at 8 hours a day at the latest. That’s maximum 1000 hours in total. For your replacement HEPAs, you can get them from our store, starting at 75RMB.

Why 140 days? Smart Air co-founder Gus tested a single HEPA on his Original DIY for 200 days to see how long it would last in real Beijing air. After 100 days of use at 8 hours a day, effectiveness dropped 4%. After 200 days of testing, Gus’s dirty filter was only removing half the particles in the room.

HEPA Filter longevity

Therefore, we recommend changing your filter after 1000 hours. You can use this number to calculate how often you need to change your filter based on how often you have your purifier running. For example, if you keep your purifier on 12 hours a day, we’d recommend replacing your filter after 60 days.

We know that buying new HEPA filters is a significant recurring cost, so we do our best to keep prices low.

Can you make HEPAs even cheaper?

We tested a 30RMB filter from China and compared it to our own filters. From the tests, we found the difference in effectiveness to be severe so we recommend avoiding unknown HEPA filters that appear too good to be true.

Smart Air HEPA Filter outcompeted Baixing

Read more about the tests we did with a cheap HEPA on our blog.

Can I wash my HEPA filter?

We tested this in our labs – we tried washing, vacuuming and scrubbing a HEPA filter to find out if there was a cheaper way of making your filter last longer. Turns out none of these methods were effective in increasing the lifespan of a HEPA filter, so we still recommend replacing them when their time is up.

Can you wash a HEPA filter?

Additional information

Weight 0.17 kg
Dimensions 29.7 × 2.2 × 29.7 cm

1 review for DIY HEPA Filter

  1. 5 out of 5

    Dr Rajesh

    Very good device. I will recommend for my patients

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Smart Air low cost purifiers

Smart Air is a social enterprise that creates simple, no-nonsense air purifiers 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.

Certified B-Corp air purifier company