5.00 out of 5
(1 customer review)

৳ 2,500.00

HEPA filters are what trap small particles like PM2.5, soot and pollen. They’re a technology that was invented over 70 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.


Your Purchase Includes                               1x DIY HEPA Filter

Type                                                              H12 (99.5%)

Colour                                                          White with black rim

Lifespan (hours)                                           650 in Bangladesh

Dimensions L x W x H (cm)                         30 x 2 x 30

H12 HEPA filter – filters out 99.5% of all particles

HEPA filters (or High efficiency particulate air) are filters that capture the really tiny air pollution particles that penetrate into our lungs and blood. The Smart Air filters capture 99.5% of even the tiniest particles, cleaning out smog, soot, PM2.5, pollen and mould.

How often should I change the HEPA filter?

We ran tests in our lab in Beijing, showing the filter should be replaced 140 days of use at 8 hours a day. That’s maximum 1000 hours in total. For Bangladesh, we recommend between 2 months of use as the Bangladesh’s air quality is one of the worst in the world, the HEPA filter lifetime is less than Beijing.

Here’s one filter a Smart Air user from Dhaka in Bangladesh showed us, which they’d used after just 11 weeks. Why so black? That’s because this user was living next to Dhaka’s busy roads, where PM2.5 levels are at their worst.

Dirty HEPA filter Manila, Philippines

Where did the ‘140 days’ come from? 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.

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 4 USD filter from China and compared it to our own filters . We found the difference in effectiveness to be severe so we recommend avoiding unknown HEPA filters that appear too good to be true.

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?

CE Certified

CE 2047 according to PED (97/23/EC). Certified by Regal Quality Registrars, Inc, UK. Made in India with imported HEPA material.

Additional information

Weight 1 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

Only logged in customers who have purchased this product may leave a review.

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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