Blast HEPA Filter


Only 2 left in stock

HEPA filters capture particulate pollution like PM2.5 and pollen, and are the key to clean air. This is the replacement HEPA filter for the Blast air purifier.


Blast H13 HEPA Filter

Cleaner air in your office and hospitals

The Blast HEPA protects you from Mongolia’s pollution

In 2020, Ulaanbaatar registered the worst air quality in the world.  Air pollution in the winter is especially hazardous due to Mongolia’s dominant heating practices. These dangerous microscopic particles are hard to escape – even our homes are filled with these pollutants.

The Blast’s HEPA filter effectively traps particles like PM2.5, dust, pet fur, viruses and mold. You won’t have to worry about your allergies or asthma any longer!







Blast HEPA’s massive area captures 99.95% of pollutants

The Blast HEPA filter is huge — 20 times the size of our Original DIY HEPAs.

We tested over 10 different HEPA materials before deciding on using an H13, 99.95% grade HEPA filter. That means it can capture 99.95% of those particles above (and below) 0.3 microns!


HEPA Grade

Are HEPA filters effective against COVID?

A common concern is whether HEPA filters can filter viruses like the COVID-19 coronavirus. HEPA filters removes particles greater than or equal to 0.3 microns, but virus particles are smaller. The coronavirus measures 0.06 to 0.14 microns in diameter. Are air purifiers then powerless against viruses?

Actually, HEPA filters actually work great at capturing viruses. This is because a HEPA filter works not like a net, but through a process called diffusion. Learn more about how this works here.

How often should I change the HEPA?

We tested a HEPA in real Beijing air for 200 days to get a sense of how long HEPAs last in real Beijing air.

Based on that data, Paddy estimated a HEPA lifespan of 5280 hours for the Blast. This is roughly equal to 22 months at 8 hours of use every day. With Mongolia’s air quality roughly comparable to Beijing, you can rest assured that these numbers will not vary much in Mongolia.

High speed setting Low speed setting

Room size: 130m²

4,600 hours
5,280 hours

Room size: 85m²

2,900 hours
3,100 hours

Can I wash a dirty HEPA filter?

Unfortunately not. We ran experiments to test this and found that washing HEPA filters does not prolong their lifespan. In fact, washing HEPA filters with water actually decreases performance. That’s why we recommend you replace your Blast HEPA filter after the maximum hours of use.

At 250,000 for two years of clean air, the Blast HEPA offers you the best prices for clean air.

Time to change the HEPA?

You’ll only need to change it every 22 months, but we still tried to keep things simple.

Your Purchase Includes 1x Blast HEPA filter
Type H13 grade (99.95%)
Colour White with black rim
Lifespan 5280 hours, or 22 months at 8 hours a day
Dimensions L x W x H (cm) 57 x 7 x 117


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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.

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