Review of the Okaysou Airmic4s Medical Grade Air Purifier

Updated on April 2, 2020
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Walter Shillington writes about products he is familiar with. His articles focus on healthcare, electronics, watches, and household items.


I’m a smoker. I try to refrain from this nasty habit while inside the house, but, once winter kicks in, I tend to cheat.

A Levoit air purifier sits in the corner of my office. While it’s a noisy contraption, this device does an excellent job of keeping the air clean.

I decided to pick up another air purifier for my living room, one capable of handling a large space as quietly as possible. After checking out the offerings on Amazon, I chose Okaysou’s AirMic4S.

Okaysou AirMic4S Air Purifier
Okaysou AirMic4S Air Purifier | Source


The Okaysou AirMic4S is 8.7 inches wide, 8.7 inches deep, and 12 inches high. It is composed of white plastic with a black colored top.

A series of slots near the bottom of the unit feed air to a H13 HEPA filter. Then a fan forces the air through the filter and upward until it exits via the upper section of the device.

The control panel, located at the top of the air purifier, is used to adjust the fan’s speed, set a timer, and either dim or turn off the unit’s night light. A separate indicator provides an alert when the filter requires replacement.

The AirMic4S is fitted with a Medical Grade H13 True HEPA Filter.

Noise level ranges from 24—51db, depending upon fan speed. At the lowest setting, the air purifier is whisper quiet and slowly cleans the air. At the highest speed, it circulates all the air in a 580 square foot room within a half hour. Only 20 minutes is required to circulate the air of a 300 square foot space, and in the case of a 150 square foot room, the time is reduced to less than a quarter of an hour.

Click thumbnail to view full-size
Front of Okaysou AirMic4S Air PurifierSide view of air purifierBack view of air purifier
Front of Okaysou AirMic4S Air Purifier
Front of Okaysou AirMic4S Air Purifier | Source
Side view of air purifier
Side view of air purifier | Source
Back view of air purifier
Back view of air purifier | Source


  • Manufacturer: Okaysou
  • Model: AirMic4S
  • Weight: 3 kilograms (6 pounds, 10 ounces)
  • Dimensions: 221 x 221 x 302 millimeters (8.7 x 8.7 x 11.9 inches)
  • Power required: 120VAC
  • Rated power: 25W
  • Effective Area: ≤12 square meters
  • Operating temperature: -10—40 degrees Celsius
  • Humidity: ˂90%RH
  • Noise level: 24 – 51db
  • Standby power: 0.5W
  • Filter: Replaceable Medical Grade H13 True HEPA Filter

Control panel, air outlet, and night light of air purifier
Control panel, air outlet, and night light of air purifier | Source

The Manufacturer

Okaysou is trademarked by Souxing Information Technology (Chongqing) Co., Ltd.

Visual Appeal

The AirMic4S is larger than many competing units but attractively designed with flowing curves and an easy to operate control panel.


The AirMic4S is fitted with a Medical Grade H13 True HEPA Filter. This air purifier is designed for small to large rooms, bedrooms, offices, nurseries, and kitchens. Its filtration system captures up to 99.97% of airborne particles as small as .3 microns. This includes dust, pollen, pet dander, pet hair, smoke, household odors, and harmful gases like formaldehyde and ammonia.

The loose-weave fabric prefilter, intended to capture large particles such as pet hair, covering the filter can be removed and washed every few weeks. The primary filter is not washable and should be replaced every six to eight months.

Four different types of replacement filters are available at the cost of $22.99. While these filters are similar, each one tackles a slightly different problem. One concentrates on removing germs; one absorbs toxins—that sounds scary, another removes odors, and one is useful for dealing with pet allergies.

Click thumbnail to view full-size
H13 HEPA filterView of air purifier's fan unitFilter fits below fanBottom view of Okaysou AirMic4S Air Purifier
H13 HEPA filter
H13 HEPA filter | Source
View of air purifier's fan unit
View of air purifier's fan unit | Source
Filter fits below fan
Filter fits below fan | Source
Bottom view of Okaysou AirMic4S Air Purifier
Bottom view of Okaysou AirMic4S Air Purifier | Source


The AirMic4S has a CADR (clean air delivery rate) of 125 square meters per hour. This figure denotes the amount of air that is cleaned of particles, sized 0.3 microns or larger, within one hour.

My living room is 14 feet wide and 15 feet long. The AirMic4S performed effectively as I chain-smoked a series of cigarettes while watching television.

Noise Level

Size does matter. My Levoit air purifier is very effective but, because its filter and fan are compact, the fan must rotate very quickly. The speeding fan produces a noise level that is quite annoying when the device is running at its highest setting.

The Okaysou AirMic4S, with its larger filter and fan, produces significantly less noise than the Levoit while cleaning a similar amount of air. Noise levels range from 24 – 51db.

View of Levoit and Okaysou AirMic4S Air Purifiers
View of Levoit and Okaysou AirMic4S Air Purifiers | Source


If properly maintained, this air purifier will last for many years. The fabric prefilter should be washed every few weeks, and the primary filter is rated for six to eight months.

The AirMic4S is guaranteed for five years, which, while unusual, does make sense. Owners are likely to continue purchasing filters rather than replacing their air purifier as long as the device is protected by a warranty.

Overall Impression

This device is well designed, and quality control appears to be excellent. If you are searching for a reasonably quiet air purifier suitable for larger rooms, Okaysou’s AirMic4S should be on your shortlist.

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

© 2020 Walter Shillington


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