OION 4-in-1 True HEPA Review

Air Purifier
Removes dust mites, pollen, pet dander, mold, and bacteria so you and your family can breathe easier.
OION 4-in-1 True HEPA

3 Speeds Plus UV-C Sanitizer

  • True HEPA.
  • UV-C Technology.
  • Sleep timer.
* On special until end June 2020

OION 4-in-1 True HEPA Air Purifier

Mark Johnson
Mark Johnson
Last Updated:  Jun, 2020
Rated from 8144 reviews.

I think you’ll agree with me when I say:

It’s REALLY hard to choose an air purifier with all the options available!

Or is it?

Well, it turns out, that after years and hundreds of hours of testing & reviewing, we have strong opinions about what makes the best air filtration system: level of purification, efficiency, and maintenance.

The OION 4-in-1 True HEPA (On special until end Jun, 2020) has all the qualities and features, giving it an added advantage and an edge over its competitors.

Quick Summary of the OION 4-in-1 True HEPA

Removes dust mites, pollen, pet dander, mold, and bacteria so you and your family can breathe easier. Pre-Filter, True HEPA, and Carbon filtration are proven to eliminate 99.97% of particles as small as 0.3 microns and destroy micro-organisms such as staph, influenze, and rhinovirus.

The Good & the Bad


  • Works well for smaller areas.
  • Small compact air purifier and very quiet.
  • Freshness in the apartment.


  • It take much air in, but it is very small and it is quiet

Key Features

  • True HEPA, and UV-C Technology – Proven to eliminate 99.97% of particles as small as 0.3 microns and destroy micro-organisms.
  • Whisper quiet fans – Silently cleans and sanitizes the air around you and allows you to choose the time of purification that suits your needs.
  • 3-IN-1 filter - Pre-Filter, HEPA – and Carbon Filtration reduces odors, freshens the air, and absorbs volatile airborne pollutants.
  • Safe Certified Technology – ETL Certified to meet and exceed industry safety standards.
  • Energy-Conscious Design – Multiple fan speeds allow you to control the strength of purification and decrease energy use when less purification is needed.

Useful Product Info

  • Product Dimensions: 9.9 x 5.2 x 7.5 Inches
  • Product Weight: 2.6 Pounds
  • Product Color: White

Common Questions

  • How to tell if UV-C Sterilizer is working?

There is a light on the panel that shows the UV light is on or off. It says Sleep on it. I think the UV bulb lasts for several months before you replace it.

  • How loud is this purifier?

No sound, very quiet.

What Others Think

At the time of writing this review, there were:

  • 40 Customers
  • Who Gave it a Rating of 4.4 Out of 5.

What's Included?

Here's what you get when you buy this Air Purifier:

  • HEPA Filter
  • Carbon Filter
  • 1 year warranty
  • 2 Fan
  • Timer

Our Verdict

The unit is an amazing air purifier, this product has provened to be worth every penny. It works very quietly and functions on a timer of 2, 4, and 8 hours and has 3 speeds.

What to Look for in a New Air Purifier?

If you’re in the market for a new Air Purifier, you’re probably looking at the different options and wondering which is the best one to choose.

Don’t worry, we’ve got you covered. Our reviews are based on the following features:


Only the most effective purifiers make the cut.

Noise Level

So there's more clean air and less noise.


Because you need a machine that’s built to last.

Ease of Use

It needs to be easy to use and easy to clean.


The Top Air Purifiers We've Reviewed


Our Rating: 9.2/10

IQAir Health Pro Plus​


Our Rating: 9.4/10

RabbitAir MinusA2​


Our Rating: 9.0/10

Winix 5500-2


Our Rating: 8.6/10

Honeywell 50250-S

Have you read our article on the this would be best smoke air purifiers?

Or our article on the top 5 therapure air purifiers?

Mark Johnson

Mark Johnson

Mark advises business, individuals, and organizations on how to use and get the best purifiers so as to maintain their offices and homes. For a fresher and cleaner environment, he is the man for you. He loves ideas and concepts and uses his skills to make them a reality.

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