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What is a HEPA Filter and How Does It Work?

If you browse the web for air purifiers or asked at the retail stores about them, you probably hear that some of them use HEPA filter. And those air purifiers that have HEPA filter are expensive. Once you see the price difference between the air purifier that uses HEPA and the one that is without this filter some questions pop in your mind.

Questions like:

Do I need an air purifier with HEPA filter?
What is HEPA filter?
Is it really so good as is the difference in the price?

What is HEPA Filter?

What Is A Hepa Filter And How Does It Work

HEPA stands for High-Efficiency Particulate Air. Only the acronym says a lot about the importance of this filter. And HEPA filter is really powerful. HEPA filter catch at least 99.97% of all particles in the air that are of 0.3 microns large or more. 0.3 microns is so small that even some bacterias can get filtered and particles like pollen, mold spores, dust, smoke can be filtered without a problem.

How Does HEPA Filter work?

HEPA is built with advanced fiber technology. Fiber is placed in the system in such a manner that big particles are collected at the surface of the filter, and smaller particles are collected while they move through the filter. With this deep filtering technology, most of the airborne particles are filtered out with HEPA filter.

Airborne particles are captured by different methods: interception, impact, and diffusion. These methods will make sure your HEPA filter is working at full capacity and that nothing unwanted will go through.

Because of this deep filtering and high-efficiency filtration HEPA filters need to be replaced regularly. If you don’t have huge contamination in your room, the HEPA filter may last up to 12 months. But if the contamination is big or your air purifier is mobile, and you use it in more than one room it is possible your HEPA filter will need replacement sooner.

HEPA filters cost some money and because of that air purifiers are not widely used all over the world. Advanced technology costs money and not many people can afford expensive air purifier with HEPA filter which needs expensive replacement every 12 months.

But individuals who did risk the money and bought an air purifier with HEPA filtering system are spreading the word. Air filtration can fix many health problems. People with respiratory problems like asthma or bronchitis can now for the small price have a better life. Now they can breathe even in the season of pollen. And we know how many people have respiratory problems when there is the pollen season.

Not all HEPA Filters are the Same

Every brand has their own system. There is one widely used by different brands, and it is called true HEPA. My recommendations for true HEPA is to all people who have some extra money to spend and want to have better and cleaner air in the room. True HEPA filter is some kind of standard in modern air purifiers.

But some brands went step ahead and made extremely high-efficiency filtering systems. HyperHEPA by IQAIR is one of those systems, and because of their HEPA filter with nanofibers, this fantastic filtration system can remove particles down to 0.003 microns. That is almost everything we know in the air. Other brands also have their own unique and trademarked HEPA filtration systems. BioGS HEPA, HEPASilent are just some of the few advanced HEPA filtration systems. These advanced HEPA systems can remove many things that standard true HEPA filter can’t.

Until now you probably realize that HEPA is must have technology in an air purifier if you really want to have clean air in the room. Air purifier without HEPA filter may be good for office or some place where you just want to remove bad odor and produce a feeling of clean, fresh air, but if you really want health benefits of clean, fresh air, you will need to go with HEPA filtration system.

Not all Air Purifiers with HEPA Filter is Same

Air purifiers that use advanced HEPA filter system that is researched and produced by their own scientists are always better than air purifiers that use standard true HEPA filter. Reason for this is that scientists that work for particular brand put the time, labor and money to create unique advanced air filtration system. You can never go wrong with that kind of air purifier. Brands that use special HEPA filters are IQAIR, RabbitAir, Blueair, and others that are not so well known, but you can read about their advanced HEPA filtration system under their air purifier manual.

Brands with exclusive filters put an effort and build an air purifier that keeps the HEPA filter clean by including prefilters. Prefilters for collecting larger particles that may make your HEPA filter too dirty too fast. Active carbon filter which can also remove some bigger particles that may pollute HEPA. By pre filtration system big brands make sure HEPA filter is used only for small particles that can not be caught with anything other than the HEPA filter.


Now you have some basic information on what is HEPA and if you really need it. And I hope that I was clear enough to say that without HEPA filtration there is no clean air. HEPA filters in the air purifier are must have, and you should always look for an air purifier that has one. HEPA filters are also not the same, and you should decide on your own if you really need the most expensive air purifier with the latest advanced HEPA filtration method that really removes everything from the air. Or you are ready to go with a standard true HEPA filter which will remove most of the particles from the air.

There is a significant difference in the price, but health does not have monetary value. You need to keep your lungs healthy, and every person needs to decide on its own what kind of filter they require.

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