Blast Mini HEPA H13 Filter

£90.00 Price excl. VAT: £75.00

In stock

HEPA filters capture particulate pollution like PM2.5 and pollen, and are the key to clean air. This is the replacement HEPA H13 filter for the Blast Mini air purifier.


Blast Mini H13 HEPA filter

Clean air in your office and clinics

The Blast Mini HEPA filter protects you from pollutants and COVID-19

Air pollution is a serious environmental and health issue. Tiny microscopic particles can slip past our body's defences and penetrate deep within our lungs and heart. Clean air in our homes is all the more important during the COVID pandemic.

The Blast Mini's HEPA filter effectively traps particles like PM2.5, dust, allergens, bacteria and viruses. Enjoy worry-free clean air in your offices and clinics!







Blast Mini HEPA's massive area captures 99.97% of pollutants

The Blast Mini HEPA filter is huge — 10 times the size of our Original DIY HEPAs.

We tested over 10 different HEPA materials before deciding on using an H13, 99.97% grade HEPA filter. That means it can capture 99.97% of those particles above (and below) 0.3 microns! The Blast Mini HEPA's efficiency means it's suitable for health facilities like clinics.

All Smart Air filters are certified to GB13554-2020 & GBT6165-2021 standards. This is the Chinese equivalent of EN1822 / ISO29463 and is independently tested.


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 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 my Blast Mini HEPA filter?

We tested a HEPA 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 3120 hours* for the Blast Mini. This is roughly equal to 13 months* at 8 hours of use every day.

* The filter lifespan will vary according to the pollution levels in your location. Using air quality data from the W.H.O., we can estimate that the HEPA lifespan for the UK will be 7850 hours or 32 months. Please use this figure as a rough guideline only as this is the average across the whole of the UK and London will be more polluted than the Scottish Highlands.

High speed setting Low speed setting

Room size: 85m²

2,900 hours (Beijing)
7,300 hours (UK)*
3,100 hours (Beijing)
7,850 hours (UK)*

Room size: 130m²

4,600 hours (Beijing)
8,961 hours (UK)*
5,280 hours (Beijing)
10,300 hours (UK)*

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 Mini HEPA filter after the maximum hours of use.

At £90 for a replacement filter, the Blast Mini HEPA offers you the best prices for clean air.

Time to change the HEPA?

The Blast Mini is easy to use. You’ll only need to change it every year or so, but we still tried to keep things simple.

Your Purchase Includes1 × Blast Mini HEPA filter
TypeH13 grade (99.97%)
ColourWhite with black rim
Lifespan3120 hrs or 13 months (8hrs per day) Beijing air
7,850 hrs or 32 months (8hrs per day) UK air*
Dimensions L × W × H (cm)57 × 7 × 57
Warranty30 days
* The GBT 18801 standard recommends replacing HEPA filters after effectiveness drops to 50% of its initial value. Our lifespan tests were conducted in Beijing but the UK average lifespan is based W.H.O. air quality data. Our filter calculator gives you a rough guideline of lifespan based on how many hours a day you run your air purifier but note, the lifespan will vary depending on the pollution levels in your city and is based on running at top speed (it will last longer on lower speeds).

HEPA Filter - FAQs

When should I replace the HEPA filters in my Smart Air Purifier?

The HEPA filter lifespan varies for each purifier. You can find the recommended filter replacement time in each of our air purifier manuals. However, lifespan also varies depending on where you use your purifier, how dirty the air is, and how often you turn it on every day. That’s why we make sure to run real-world tests on all our purifiers, and provide a HEPA filter lifespan calculator to help you calculate how often you need to change your HEPA filter for your exact situation.

Why do my HEPA filters smell?

The HEPA filter is made of non-toxic PP/PET material. A new filter may have a faint scent from the glue which is also non-toxic. After being used in the purifier for 2-3 days, this scent will fade away.

If the filter is left unused for a period of time with no wind passes through, the excessive moisture in the air will aggravate the breeding of bacteria, which produces acidic smell when turning on the model again.

In this case, you can turn on the machine and let the wind blow through several times, or put the filter under the sun for a few days. If all the above does not work, it is recommended to replace the filter.

Why not use a higher grade HEPA filter?

Smart Air’s current HEPA filter is selected from more than 20 different pricings and different purification efficiencies after many experiments and comparisons. A higher grade filter with a higher purification efficiency also means lower airflow. Thus, we combined the fan power and effectiveness to select the current filter. See here for more details:

Does HEPA filter efficiency decrease over time and with age?

This question is answered in two ways:

  1. Over time, HEPA filters actually get more effective at capturing tiny particles. As a HEPA filter gets used, it gets filled up with dirt and particles. This improves the HEPA filter’s ability to filter out the air.
  2. As a HEPA filter gets more and more clogged up with particles, the resistance to air passing through the filter also increases. This means that although the filter is better at capturing particles, it’s more difficult for air to pass through it.

Overall, these two factors mean that a HEPA filter’s overall ability to clean a room (or the air purifier’s airflow and CADR) does decrease over time and with use.

Does Smart Air recycle filters?

For now, we don’t provide recycling service, because there is no proper way to do so. We tried to make the filters as environmentally friendly as possible. For example, we replaced metal frames with biodegradable cardboard. We also make sure to only use certified environmentally friendly glue in our filters, and to reduce the amount of glue without compromising on cleaning efficiency. E.g. for the Blast and Blast Mini filters, when we switched from metal to cardboard frames, we also reduced the total glue used, being even more environmentally friendly!

Additional information

Weight 3.8 kg
Dimensions 60 × 60 × 9 cm


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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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