Okaysou AirMax8L H13 True HEPA Air Purifier Review In 2023: Under $100?

A high-performance air purifier for under 100? Okaysou AirMax8L is your answer. A medical-grade, ultra-duo filtration system air cleaning machine can make a big difference in your indoor air quality. Being one of the best cheap air purifiers in the market, can Okaysou AirMax8L be the one solution for all your allergy troubles? What is the little trade-off needed to compensate for the low price point? Find out in our full review below.
online price (US)**
±118.99 $$$/ 7

(annual filter cost ±38-78)

** MRSP (Manufacturer's Suggested Retail Price)/ RSP (Retail selling price) is accurate at the time of posting.
^ Annual filter cost is calculated based on filter price and 12 hours of usage. Pricing could vary depending on air quality, usage frequency, and speed.
` The indicated online price guides as follows: $ = under $50, $$ = $50-100, $$$ = $101-200, $$$$ = 201-300, $$$$$ = $301-400, $$$$$$ = 401-500, $$$$$$$ = over $500.

Okaysou AirMax8L Specification

ProductOkaysou AirMax8L
12.9 x 19.4 x 7.1 in
(32.8 x 49.3 x 18 cm)
Weight13.7 lb (6.2 kg)
Coverage (up to)320 sq. ft. (30 m2)
Airflow speed
Dust free (CADR)210 cfm (357 m3/h)
Pollen free (CADR)210 cfm (357 m3/h)
Smoke free (CADR)210 cfm (357 m3/h)
Humidifying(H) speed
- Lifespan
- Replacement cost ($)
>6 months
HEPA filter
- Lifespan
- Replacement cost ($)
H13 True HEPA filter
6 months
Carbon filter
- Lifespan
- Replacement cost ($)
Active carbon filter
6 months
Ionizer/ Technologies
UV-light/ PCO
Other filter
Antibacterial filter
6 months
Cold catalyst filter
6 months
All-in-one filter
- Lifespan
- Replacement cost ($)
Blue Ultra-Filter
6 months+- 19
Ultra-Duo Filter
6 months+- 19
Optional/ Addon
Noise level22-51 dBA
Power usage level50 W
Timer/ Scheduler
Auto mode
Air qualityAQ indicator
Filter change indicator
More color options
Wi-Fi/ BTBluetooth
Remote control
Child lock
Warranty5 years
Email/ Phone support

Key Features

  • 3-Stage Ultra Filtration and 2-Stage Duo Filtration
  • 3 fan speeds with sleep mode and child lock
  • H13 True HEPA filter with antimicrobial - 99.97% removal efficiency
  • Odor eliminator carbon filter
  • Cold catalyst filter - Remove toxic household chemicals
  • 800 sq. ft. (1.5x air changes per hour)/ 500 sq. ft. (3x per hour)/ 320 sq. ft. (5x per hour)
  • Advanced Silenceboost Technology with 45 Vanes Turbine Motor and creative internal structure
  • 1/ 2/ 4/ 8 hour timer
  • Intelligent filter replacement indicator
  • CE, FCC, ETL, CARB certified and 100% Ozone Free
  • 5 years assurance warranty with lifetime US-based customer support

Design and Usability

There is more than meet the eyes with the Okaysou AirMax8L air purifier. At first glance, it may seem like a typical air cleaning device, but underneath the 12.9 inches width and 19.4 inches height is an ultra-duo filtration system that can break down even the toughest pollutants and gases. To support the 5-stage filtration, a bigger turbine is fitted into the machine that pushes the weight to 13.7 pounds. Heavy but still possible to move it around for a room to room purifying. The bottom air inlet is nicely hidden from the clean white exterior without having to compromise on the airflow distribution. Overall, the build quality is good with no sign of off-gassings.

Moving to the top controls, you have the standard 3 fan speed plus speed mode, child lock, timer, and a filter replacement indicator. Child lock is a nice feature to have that prevents children from messing with the setting and the 4 preset timers are very useful to manage the air purifier running hours. The sensitive intelligent filter replacement indicator is great to remind you to change the filter when it is damaged or worn out. An air cleaner with a dirty filter is as good as useless.

Let’s round up the other features you will find in this affordable air cleaner. For a start, the safety assurance CE, FCC, and ETL are all here. Okaysou AirMax8L is also CARB certified to be 100% Ozone Free. Finally, an impressive 5 years warranty with lifetime US-based customer support is well appreciated to quickly resolve any issue.

Airflow, Coverage, And CADR

Combining an advanced turbine motor and Ultra-Duo filtration system, Okaysou AirMax8L deliver an abundance of air cleaning power via the 3 adjustable fan speed. At 1.5 air changes per hour, the air purifier can cover up to 800 square feet of room size. Suitable for living room, basement, garage, kitchen, bedroom, lounge, and dining area. For an asthmatic person or people with severe allergies, you can increase the air count so clean air can be delivered faster. As such, the purifying coverage will drop to 500 square feet at 3 air changes per hour and 320 square feet at 5 air changes per hour. The clean air delivery rate (CADR) is equally as impressive as the airflow circulation. All dust, smoke, and pollen are rated at 210 cfm by AHAM, exceeded our 200 cfm benchmark. There is no air purifier in the market that offers such capacity at this price point. The only letdown is the lack of auto mode that can come in handy for those that does not like to tinker with the setting.

Recommended Read

Filters And Performance

It comes as a surprise that Okaysou AirMax8L manage to fit in a 5-stage Ultra-Duo filtration system despite being so affordable. Starting with the fine preliminary filter that traps large particles like dust, hair, debris, and pet fur. The washable pre-filter is also designed to protect the HEPA filter from being damaged by unwanted particulates. Moving to the highlight, the medical-grade H13 HEPA filter will capture 99.97% of microscopic particles as small as 0.25 microns e.g. pet dander, dust mite, pollen, mold spore, germ, bacteria, and virus. To inhibit the captured mold and germs from spreading, the coated antibacterial filter will inhibit microbes' growth. For smoke particles, the carbon filter is there to remove cooking smells, stinky diapers, and pet odor. Lastly, the cold catalyst filter eliminates toxic fumes and chemicals like formaldehyde, VOCs, benzene, ammonia, and hydrogen coming from cigarettes, paint, outdoor pollution, and cleaning product. Overall the filter quality is decent despite being slightly thinner and smaller than usual.

Noise And Energy Usage

Here is another strong point of the Okaysou AirMax8L air purifier. The latest Silenceboost quiet technology produced less noise and less energy than its competitor model. At the lowest speed, noise output is a whispering noise of 22 dBA and not more than 51 dBA at full speed. For everyday use, set it to second or third speed that will strike the balance between performance and noise. For night use, set it to sleep mode before you hit the bed. Enjoy breathing in cleaning air the whole day without any interruption.

Taking into consideration how powerful airflow output is, Okaysou AirMax8L is averaging 50 watts per hour. Even if you leave it running all day every day, it will have little impact on your electricity bill. Doing some simple math, the cost is around $0.1 dollars per day with 12 hours of operation, or $3.2 dollars a month, $38 a year. For the recommended 24 hours running time, multiply everything by 2 so $0.2 per day, $6.4 a month, and $72 a year.

Noise TypeDecibels
Okaysou AirMax8L22-51 dBA
Breathing10 dB
Rustling leaves20 dB
Whispering/ Quiet library30 dB
Light rainfall40-50 dB
Conversation50-60 dB
Vacuum cleaner/ Hair dryer/ Washing machine65-80 dB
City traffic80-90 dB

Pricing And Maintainence Cost

There are so many other models that charge more but offer way less. Okaysou AirMax8L H13 True HEPA air purifier is retail around 120 but you can easily get it under 100 dollars. For such a low price, you'll get a decent filtration performance and a must-have top-grade H13 True HEPA filter. Filter replacement cost is also on the lower side between 38 to 72 dollars depending on usage hours and room air quality. Even though the filter available is limited, you can still find the filter replacement set online via Amazon.
Forget about going to retailers like Walmart, the best place to buy Okaysou AirMax8L air purifier is at Amazon or their official website. If you go through their website, you'll get a 10% discount on retail price plus free shipping. Better yet, buy from Amazon and you will enjoy greater discounts, bundled deals, fast shipping, 30 days return policy, and the sheer convenience of not having to register a new account.

Final Thoughts On Okaysou AirMax8L

So what do the other owners think of the Okaysou AirMax8L air purifier? A whopping 92% loved it and gave it a 4-5 star ratings. A large chunk of the reviewers feels this is the best affordable air purifier in the market despite being a relatively unknown brand. Most buyers are happy with the filtration quality, build quality, and of course, the unmistakenly H13 True HEPA filter. They can feel improvement in their indoor air quality where they cough and sneeze way less at home. As for the cons, a low 4% of the users are not happy with their purchase due to faulty unit. A few users also complained about the limited filter availability compared with other household brands. So if you are not particularly picky with your options and don't mind breaking from the norm, Okaysou AirMax8L True HEPA air purifier is a good call.


  • Less than 100 for a genuine HEPA air purifier with 320 CADR.
  • Circulate up to 800 square feet at 1.5x air changes per hour. Great for living room, bedroom, garage, basement, and kitchen.
  • Medical grade H13 True HEPA filter effectively removes 99.97% airborne particles as small as 0.25 microns.
  • Antimicrobial filter that inhibits the growth of bacteria and viruses.
  • Deodorizing active carbon filter + cold catalyst that removes smoke, cooking odors, formaldehyde, VOCs, Hydrogen, and ammonia.
  • Timer, Child lock, and Sleep mode with whisper-quiet Silenceboost Technology.
  • 5 years warranty with lifetime US-based customer support.


  • While it is cheap, the inclusion of auto mode would be welcome.
  • The combined 5-in-1 filtration is expensive to replace.

Verdicts And Ratings

Build Quality



Particle Filtration

Smoke Filtration


Filter Cost



Okaysou AirMax8L H13 True HEPA Air Purifier Review

Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.

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