True HEPA Filters – The Secret To Effective Air Purifiers

hepa air filter cover image

True HEPA filters keep the air clean 

Behind every air purifier is HEPA (High-Efficiency Particulate Air) filter – the winning formula to having clean air. The high-functioning air filter removes 99.97% of air pollutants of up to 0.3 microns, which even includes airborne viruses. This is why airline cabins such as Singapore Airlines, hospitals, and clinics use True HEPA filters in light of the COVID-19 situation.

If you’re looking for one to protect you and your loved ones, here’s the low-down on how True HEPA filters work and the long-term benefits it brings.


How HEPA filters work

hepa air filter process
Image adapted from: cowaymega.com

Made of interlaced glass fibres, HEPA filters get rid of airborne pollutants via 3 different ways – direct impact, interception, and diffusion. 

Direct impactHuge particles collide and stick to fibres by impact.
InterceptionParticles flow with the airstream and are trapped by fibres.
Diffusion According to Brownian motion, small particles zig-zag and crash onto each other before getting stuck onto a fibre.

According to a study by NASA, viral particles, like the coronavirus, may be smaller than 0.3 microns but a True HEPA filter can easily filter it out via interception and diffusion – the last stage of the filtering process.

Since tiny particles tend to travel randomly, they are more likely to hit onto a fibre as a result. As such, HEPA filters are capable of capturing the smallest airborne particles at a near 100% efficacy.

As such, pesky contaminants such as dust mites, allergens, even downright to fine particles like viruses, are effectively removed via the 3-way process.

You can check out the graph by NASA here:

NASA hepa filter process
Image credit: NASA

Given its impressive track record, most air cleaning brands now include HEPA filters in their air purifiers.  


Do all HEPA filters work the same?

cosmo's hepa air filter

HEPA filters of different standards don’t share the same filtering efficacy. You may have heard of the term ‘HEPA filter’ or ‘True HEPA filter’ and might be confused with both terms. Here’s a concise breakdown of what it means:

HEPA FilterTrue HEPA Filter
European standards
Remove at least 85% of air pollutants of up to 0.3 microns
American standards
Remove 99.97% of air pollutants of up to 0.3 microns

While the term ‘True HEPA filter’ is more of a marketing term, it’s a handy way to differentiate between American and European HEPA standards. Note that HEPA filters as per the American standards have better filtering efficacy. 

Once you’ve zeroed down to air purifiers with ‘True HEPA filters’, keep tabs on what makes each air purifier brand different

cosmo air purifier air filter

For example, the Cosmo Prime® Air Purifier’s in-house engineered True HEPA filters are 20 times finer than the average filter. With a 360 Structural Design, air is filtered from multiple sides, rather than just a single direction. 

Not only does it better filter harmful pollutants, but it also releases anions – healthy ions that enhance immunity and keep your allergies’ triggers away. Its True HEPA filter also contains activated carbon to remove odour from the air. 


Healthful effects: Reduce asthmatic and allergy triggers

hepa air filter allergies
Image credit: Polina Tankilevitch

Homeowners suffering from asthma or allergies can find comfort in air purifiers with HEPA filters. However, this does not mean that HEPA filters are foolproof replacements for medicine or other proven methods.

In reality, the effectiveness of an air purifier with HEPA filters may vary as compared to in controlled settings. There are plenty of external factors such as the condition of the filters, how much space can your air purifier filter, downright to the possible emergence of new particles indoors and how serious your condition is. 

While there is no substantial medical proof that air purifiers with HEPA filters can maintain the same efficacy in the real world, plenty of patients showed lower episodes of allergic triggers in a study conducted in 2018


Cosmo Air Purifier – Singapore’s best-reviewed air purifier

cosmo air purifier air filter

Whether you’re keeping your family safe from the threats of COVID-19, practising healthy living, or both, Cosmo Prime® Air Purifier is a winning choice as Singapore’s best-reviewed air cleaner.

Aside from its enhanced True HEPA filters, the Cosmo Prime® Air Purifier doubles up as night light and has silent features optimised for light sleepers. Budget-savvy homeowners won’t have to vex as well. The Cosmo Prime® Air Purifier retails for just $450, with long-lasting HEPA filter replacement of up to 1.5 years. Here’s a price comparison guide on other popular air purifier brands as reference.

With FREE same-day delivery, you can still practice social-distancing and kickstart your healthy living ASAP from home.   

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