How HEPA Filters Work, New Resource by Camfil


Riverdale, 01/27/2023 / Camfil USA Air Filters /

Although HEPA filters were invented in the 1950s, devices that used them have seen an explosion in popularity in recent years. In response, the market has been filled with thousands of products that claim to use HEPA filters without the factory testing to back it up. In a new online resource, air filtration professionals from Camfil USA explain how HEPA filters work and how to determine which air purifiers and other products actually deliver HEPA-level filtration.

“Many so-called HEPA air filters on the market may not actually provide this level of protection or anything close to it because there is no evidence the filter achieves HEPA-level performance,” said Mark Davidson, Manager of Marketing and Technical Materials at Camfil USA. “As a result, many air cleaners and air purifiers that advertise HEPA filters are actually not offering the protection from airborne viruses that consumers paid for when they purchased those devices.”

The resource covers:

  • What is a HEPA filter?

  • How do HEPA filters work?

  • What does ‘most penetrating particle size’ (MPPS) mean?

  • How do you know if a HEPA filter is real?

Read Camfil’s full resource on how HEPA filters work here.

About Camfil Clean Air Solutions

For more than half a century, Camfil has been helping people breathe cleaner air. As a leading manufacturer of premium clean air solutions, we provide commercial and industrial systems for air filtration and air pollution control that improve worker and equipment productivity, minimize energy use, and benefit human health and the environment. We firmly believe that the best solutions for our customers are the best solutions for our planet, too. That’s why every step of the way – from design to delivery and across the product life cycle – we consider the impact of what we do on people and on the world around us. Through a fresh approach to problem-solving, innovative design, precise process control, and a strong customer focus we aim to conserve more, use less and find better ways – so we can all breathe easier.

The Camfil Group is headquartered in Stockholm, Sweden, and has 31​ manufacturing sites, six R&D centers, local sales offices in 35+ countries, and about 5,200 employees and growing. We proudly serve and support customers in a wide variety of industries and in communities across the world. To discover how Camfil USA can help you to protect people, processes and the environment, visit us at


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Lynne Laake

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