OION APW-4000 Air Purifier: Trusted Review & Specs

The OION APW-4000 is the most stable and available air purifier of the OION Technologies lineup. A budget device with a safe certified air filtration technology is all you need for the very low budget, and in our today OION APW-4000 Review, we will check if it’s worth buying.

The OION APW-4000 ranks really low in our ranking list, so we highly recommend you take a look for the Levoit LV-H128 or Airthereal ADH50B.

OION APW-4000 ranks D- in our air purifier ranking list. We give the biggest and most thorough database of air purifier reviews in the world.

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  • We do give honest reviews (both pros and cons) so anyone will guarantee to have the wisest choices.
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oion apw-4000 review

  • Small, compact size
  • Budget option
  • Low energy consumption

  • Not CARB certified
  • Very low fan power
  • Everything does wrong

OION Technologies is an air purifier company with many devices available, including of ozone generators and ionizers. The OION APW-4000 is supposed to be the starter HEPA air purifier of the company, and as the OION LB-999 is sometimes out of stock, this is the most popular air purifier of this brand. Let’s have a look at our OION APW-4000 Review.

Other OION Technologies’s Air Purifier Reviews:

1, OION LB-999 Review.

2, OION B-1000 Review.

OION APW-4000 Price

OION has made a lot of ionizers and ozone generators, as you can clearly see their products in the name: O-ion. The OION APW-4000 is the first compact HEPA air purifier to be shown, and I must say it is really necessary to choose this device for a better and safer air cleaning.

It has True HEPA filter, or that is the claim of OION Technologies, together with an UV-C light filter to remove the organic pollutants. It even has a Timer setting, and keeps the price as low as $57 on the official website of OION Technologies. Meaning it’s even cheaper than the signature OION B-1000 of the company.

So far, the OION APW-4000 is the white model of this air purifier. If you prefer the black version, you should look for the OION APB-5000. Select our below deal to get the OION APB-5000.

This is the price range where you usually consider the Envion Therapure TPP100, Bissell MyAir and Levoit LV-H126 instead, but if you really want an UV-C light filter, the GermGuardian AC4150 and Eureka Instant Clear NEA120 are the better options to go for.

Top OION APW-4000 deals right now

The OION APB-5000, the black version of the official OION APW-4000. 4-in-1 True HEPA air purifier 3 speeds plus UV-C sanitizer.

Whisper quiet and Timer for sleep. Safe certified technology with ETL certification.

Related post: Best air purifier 2023.

OION APW-4000 Design and Size

This budget air purifier finds itself going up against the likes of the popularity of Chinese air purifiers: Okaysou AirMic4S or Elechomes EPI081. It has a tidy and compact design which looks good. Pick it up and it feels lightweight, and the plastic body is noticeable, thanks to the size of 7.5 inches in height and 9.9 inches in width.

Round the back, we have a tabletop air purifier at only 2.6 lbs. Can’t believe to get an air purifier that works at so little weight? Let’s find out yourself.

The air purifier runs a simple and common bottom-to-top air flow system concept. OION APW-4000 is like a mini Levoit Vital 100 for its placement of top control panel, and the device can be set horizontally for a back-to-front air flow system concept, and direct the fresh air toward the user.

The OION APW-4000 is the official name of the white version of this air purifier. If you prefer the premium black color option, you should search for the OION APB-5000. It is available through our deal, too.

oion apb-5000 review

Related post: Best air purifiers for bedroom.

OION APW-4000 Filters

OION APW-4000 is the first air purifier to not include the ionizer in its air filtration system, among others of OION Technologies. You will get a simple 4-in-1 air cleaning system as told by the manufacturer.

  1. Pre-filter – The pre-filter can capture large particles such as dust, pet hair and fur, to protect and extend the HEPA filter’s life.
  2. True HEPA filter – Traps 99.97% of any particles as small as 0.3 microns, like pollen, mold spores, pet dander, dust or dust mites.
  3. Activated Carbon filter – Adsorbs cooking smell, pet odors and Volatile Organic Compounds (VOCs).
  4. UV-C light filter – A built-in UV-C Sterilizer further eliminates pathogens and germs.

OION isn’t the brand you should go for if you demand the high efficiency of your air purifiers. I made a simple test for all OION air purifiers, including of the OION APW-4000 in a room of 100 square feet, and you can check its performance below. It can trap only 80% of any particles down to 0.3 microns, which is fairly bad for an air purifier in such small space.

Moreover, the OION APW-4000 is certified by the California Air Resources Board (CARB), so you should think again when buying the product.

oion apw-4000 review

Moreover, the air filter’s availability of this OION APW-4000 is scarce, and I will update the article whenever I find the genuine filter for you guys. The filter costs only $9, but it can last for less than 2 months.

Related post: Best air purifiers for allergies.

OION APW-4000 Room Coverage

The manufacturer suggests 107 square feet for this OION APW-4000, but through rigorous tests, I believe its room coverage is less than 100 square feet.

The ACH of OION APW-4000 is 2X. This air purifier has low fan power, resulting in less air exchanges per hour.

The CADR of OION APW-4000 is 30 cfm in general.

Related post: Best large room air purifiers.

OION APW-4000 Sound

Thanks to its very low fan power, the OION APW-4000 is fairly quiet. Its average noise level is just 30 decibels (db), and it’s just like the whisper. You can use the air purifier while sleeping, but remember to turn off the UV bulb for no ozone emission.

Related post: Best air purifiers for baby.

OION APW-4000 Power Consumption

One of our most FAQs is “Do air purifiers use a lot of energy?” In fact, air purifier must be used for a long time to be efficient. And power consumption is one important criteria to review if this air purifier is good or not.

The OION APW-4000 has a power consumption from 7.5 to 40 watts, and it is reasonable for an air purifier with such low fan power.

If you run the OION APW-4000 for at least 8 hours per day, you only need to pay $3 – $14 each year.

Related post: Best air purifiers for pets.

OION APW-4000 Additional Features

Unlike a lot of air purifiers in this price range, the OION APW-4000 doesn’t come with nothing. It has a basic Timer to schedule the time off for the device, after 2, 4 or 8 hours.

Also, the air purifier has a LED indicator for filter replacement. It is just the basic settings, but it’s nice to have.

Related posts:

1, Best air purifiers for smoke.

2, Best air purifiers for dust.

3, Best air purifiers for mold.

OION APW-4000 Customer Service

OION Technologies is good at customer service. For any questions, you can reach them at customerservice@oionair.com.

OION Technologies provides Free Shipping for all U.S orders, and they also offer International shipping option for their products. If you don’t satisfy with the OION air purifiers, you can return it within 60 days of purchase.

Any air purifiers of OION Technologies are covered with a 2-year warranty.

Top OION APW-4000 deals right now

The OION APB-5000, the black version of the official OION APW-4000. 4-in-1 True HEPA air purifier 3 speeds plus UV-C sanitizer.

Whisper quiet and Timer for sleep. Safe certified technology with ETL certification.

Our verdict

OION APW-4000 and OION APB-5000 are really cheap, but I don’t think you should spend less money for an improper air purifier. You should pay more for the Levoit LV-H128 at least.

OION APW-4000 Air Purifier: Trusted Review in 2024
OION APW-4000 Air Purifier: Trusted Review & Specs

OION APW-4000 Reviews and Specs (Air Purifier Trusted Reviews in 2024). ✓ Cleaning Power: True HEPA filter ✓ Value: 2.1/5 ✓ Certified Review.

Product Brand: OION Technologies

Product Currency: USD

Product Price: 57

Product In-Stock: InStock

Editor's Rating:
  • Performance
  • Features
  • Annual Cost
  • Design
  • Price


It is cheap and compact, but it is sooooo weak. Can’t recommend.