Blast HEPA Filter


In stock (can be backordered)

Replacement HEPA filter for the Blast purifier; Notice: we are currently running out of the Blast HEPA filter, and our factory is working hard on the new batch. You can still place your order now and the replacement filter will be sent out at the beginning of June.

Blast HEPA Filter surface area

Purifier companies can make obscene profits when most people don’t understand how purifiers work. Here’s the honest truth: a purifier is fan + a filter. In this case, that fan and filter are just 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% HEPA filter. That means it can capture 99.95% of those particles above (and below) 0.3 microns!

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 the HEPA lifespan for the Blasts. These estimates for the Blasts are for 8 hours of use every day. If you use it more or less, you can calculate lifespan using the total number of hours below.


HEPA Filter change frequency


Time to change the HEPA?

You’ll only need to change it every 7-20 months, but we still tried to keep things simple.

HEPA Filter change procedures

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.


Your Purchase Includes 1x Blast HEPA filter
Type H13 (99.95%)
Colour White with black rim
Lifespan (hours) 2250 – 2800
Dimensions L x W x H (cm) 57 x 7 x 117

Additional information

Weight 6.8 kg
Dimensions 119 × 60 × 9 cm


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