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What exactly is a HEPA filter?

What exactly is a HEPA filter?


A “HEPA” stands for a high-efficiency particulate air filter. These filters are often used in hospitals and other industries where clean air is required such as food and pharmaceutical industries. A HEPA filter is a special type of filter that captures microscopic particles such as pollen, dust, pet dander, bacteria, hair, mould spores and any particular matter that comes with air from the outside.

 

Do HEPA filters come in different types?


When you’re looking to purchase an air purifier equipped with a HEPA filter you may come across devices that have different types of HEPA filters, such as:

True HEPA H13 – captures the widest range of contaminants, and is certified to capture 99.97% of particles as small as 0.3 microns.

HEPA, HEPA-like and HEPA-type H10-12 – capture a smaller range of contaminants, and is certified to capture particles that are 2 microns or larger. 

The differences between these are big as the True HEPA filter is almost 500% more efficient than the other types.

 

How do air purifiers with HEPA filters work?


Air purifiers with HEPA filters are devices that clean the air by removing microscopic contaminants. These filters were designed during the Second World War as part of the Manhattan project to control radioactive particles.  

True HEPA filters are made from fibreglass arranged in a mat of randomly placed fibres.  Particles such as dust, pollen, pet dander and various allergens are trapped by sticking to the fibre through diffusion, interception or impact.

The very tiny particles are trapped through the process of diffusion. It’s the process that slows down the contaminants as they collide with gas molecules.  As a result, they stick to the fibres of the filter.

Small particles are intercepted as they flow through the filter.  Larger particles simply cannot get through the fibres of the filter without hitting them directly.  As a result, they get captured inside the HEPA filter.

 

 What are the benefits of HEPA filters for allergy relief?


Air pollutants such as dust mites, mould spores, pollen, and pet dander can cause serious problems if a member of your family has allergies or asthma.  Using an air purifier with a True HEPA filter may help bring allergy relief by removing air born particles.

 

What are the advantages of HEPA filters?


These type of filters come in different sizes and budgets and they are very good at capturing both large and small particles from the outside air.  They offer a great advantage to the individuals suffering from asthma, allergies or any other respiratory problems.

 

 What are the drawbacks of HEPA filters?


The only drawback to HEPA filters is that they can’t capture odours and chemical gases.


How often does the HEPA Filter be replaced in air purifiers?


The time when you need to replace your HEPA filter depends on two things.  If an air purifier has two methods of purification, HEPA filter and an active carbon filter then the HEPA filter needs to be replaced 6-12 months and the active carbon filter every 3-6 months.


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