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Oransi EJ120 HEPA Air Purifier Review

Updated November, 2022

The EJ120 air purifier by Oransi is marketed as one of the best pet air purifiers for large rooms. Not only can it handle pet hair and pet dander, but it’s also able to trap other harmful pollutants including smoke and dust, and mold spores. But what captures our attention is the fact that the air purifier uses medical-grade filters. The air purifier is tough enough for use in the medical field and can work around the clock to purify larger spaces in just a fraction of the time it takes your standard air purifier to clean the air in a smaller room in the home.

Our Verdict: If you suffer from allergies and need a medical-grade air purifier, one that can quickly and efficiently clean the air and remove any environmental pollutants, then this model may be your best bet. Rated as an air purifier that can be used in hospitals, operating rooms, and in labs, the EJ120 may cost a pretty penny, but it definitely gets the job done. We would recommend this model to the serious allergy sufferer or for use in multi-pet homes.

Keep on reading to find out more about this best-selling air purifier by Oransi.

Overview and Features

This air purifier boasts one of the widest coverage ranges of any air purifier that’s sold for residential use. But despite the fact that the EJ120 is designed for residential use, the machine itself is actually rated as commercial quality. This model can be used in hospital operating rooms and labs, thanks to its ability to eliminate over ninety-nine percent of environmental contaminants.

Filter Technology

This model uses a two-stage filtering process. The true HEPA air purifier filter is able to capture up to 99.97% of particles measuring in at 0.3 microns and larger. The particles the filter is able to trap can range from contaminants that are visible to the human eye and ultra-microscopic particles. The filter is able to trap contaminants thanks to its complex web of fibers. This is accomplished in four ways, either by:

  • Sieving
  • Interception
  • Diffusion
  • Inertial impaction
Oransi EJ120 HEPA Air Purifier

Product Rating Updated November, 2022: (4.5/5)

Oransi EJ120 HEPA Air Purifier

  • Medical-grade air purifier
  • Two-stage filtration process
  • Easy to use
  • Whisper-quiet operation
  • Premium quality
  • Manufactured in the USA
  • Sturdy construction

Larger particles are trapped via sieving and inertial impaction. The trapped contaminants will become trapped as they travel through the fibers or by colliding with the fibers. Slightly smaller particles will be intercepted by the fibers. Microscopic particles are dissipated as they make their way through the fibers, eventually colliding with the fibers, unable to escape.

As we mentioned, this is a two-stage filter. Not only does the air purifier use the popular HEPA filtration system it’s also equipped with an activated carbon filter, which also comes with many benefits. Carbon filters help to trap odors and can also trap other impurities and known allergens including:

  • Pet dander
  • Pet hair
  • Mold spores
  • Dust
  • Dust mites
  • Household chemicals

When used with a true HEPA air purifier filter, the activated carbon filter increases the HEPA filter’s efficiency, especially when it comes to trapping common allergens in the home.


The typical air purifier designed for residential use can only handle treating smaller rooms that measure in at around three hundred feet, although there are tougher models, such as the Blueair Classic 605 Air Purifier, which can handle spaces up to seven hundred feet.

This air purifier easily blows the competition out of the water with its ability to treat spaces up to fifteen hundred square feet, making it a perfect choice for use in the common spaces of your home such as the living room or basement.

Quiet Operation

This model is also considered one of the most quiet-running air purifiers on the market. When switched to the lowest setting, the fan is essentially whisper-quiet.



On the lowest setting, it’s true that you’ll barely notice the air purifier at work, but when switched to high, it does make a very audible hum. Noise aside, the air purifier’s biggest flaw is its lack of built-in timers. Since there are no timed setting options, you must manually turn the machine on and off. Additionally, there is no automatic mode or air quality sensors. On competing models, the addition of an air cleaner sensor, combined with an automatic mode, allows the machine to switch on or off based on air quality readings. Considering the price, we were disappointed that this machine lacked these very important features.

In terms of air purification efficiency, this model goes above and beyond. If built-in timers and the lack of an automatic mode aren’t at the top of your list of priorities, then this well-made, efficient air purifier will be a great addition to your home.

Related Questions

Do The Filters Need to be Replaced Every Month?

No. The true HEPA air purifier’s filter should be replaced every six months. The activated carbon filter must be replaced every three months. However, if you live in a multi-pet home, you may need to replace the filters more often, especially if you have long-haired cats or dogs.

Is This a Good Air Purifier for Asthma Sufferers?

Yes. This model is able to trap air pollutants as small as 0.3 microns, this includes pet dander and pollen, two of the most common allergens.

Does This Air Purifier Have a Built-in Timer?

No. Unfortunately, this model does not have any automatic timer settings or air quality sensor settings. This means you will need to manually switch the air purifier on and off.


  • Medical-grade air purifier
  • Two-stage filtration process
  • Easy to use
  • Whisper-quiet operation
  • HEPA air purifier
  • Excellent air cleaner


  • Does not come with a built-in timer
  • No air quality sensors
  • Price

Conclusion and Rating

Product Rating: (4.5/5)

Oransi EJ120 HEPA Air PurifierHow to keep home clean in a multi-pet home can be a real challenge, but aside from pet dander and hair, you also have to worry about other harmful contaminants including mold, dust, and pollen. The EJ120 by Oransi takes care of all of that and more. A model that’s recommended for hospital use, this medical-grade air purifier can work around the clock to keep your home smelling fresh and free of common allergens. We gave this model a rating of four and a half stars out of five stars.

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Reviewed Item
Oransi EJ120 HEPA Carbon Filter Air Purifier
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