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Coway Airmega 400 Air Purifier: Is It Worth Your Money?

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Coway Airmega 400 - Large Room Air Purifier - CowaymegaCoway is dedicated to achieving a healthier indoor air quality for everyone. The company manufactures products that are well-designed, intelligent, and efficient filters at reasonable prices. Coway has a meticulous quality standard. It has a dedicated customer care staff to assist users who are having problems with the product or the order.

Coway’s air purifiers match your demands, whether you need one for asthma, sinusitis, smoking, or foul odor. The Airmega 400 patented the Coway Max2 filter, a modern filter technology composed of Activated Carbon and True HEPA filters. This architecture provides an excellent indoor air solution to help users inhale healthier, cleaner air.

Coway Airmega 400: Specifications

Coway is known for producing some of the best air purifiers, water purifiers, and bidet toilet seats on the market. Many of its products earned several awards for design, creativity, and innovation. Conway has received several honors, including the prestigious CES Innovation Award.

Coway Airmega 400 Specifications

Room Coverage 2 air changes/hr.*  1,560 sq ft (145 sq m)

4 air changes/hr.** 780 sq ft (72 sq m)

CADR (Clean Air Delivery Rate) 328 (Smoke), 328 (Dust), 400 (Pollen)
Filter Type Washable Pre-Filter + Max2 Filter Set

Max2 Filter

Filter Life Expectancy One Year
Smart Mode Auto Mode: Yes

Eco Mode: Yes

Sleep Mode: Automatic

Fan Speed Sleep, Low, Medium, High
Mobile App No
Timer Airmega Product (1, 4, 8 hours)
Scheduler No
Noise Level 22~52 dB(A)
Dimensions (W x H x D) 14.8 x 22.8 x 14.8 in.
Product Weight 24.7 lbs
Power Consumption 66 W


The room coverage is the size of the room where the air purifier can make two air changes per hour. “One air change per hour” shows how often the device can clean a spot in one hour, assuming the ceiling is eight feet high.

* Coway Airmega can clean the area once every 30 minutes.

** Coway Airmega can sanitize the room once every 15 minutes.

The product has a 30-day Money-back Guarantee.

Coway Airmega 400: Features and Benefits

Now that you know the specifications of Airmega let’s discuss how these features translate to real benefits.Coway Airmega 400 smart air purifier review - CADR, filter & manual - Consumer Reviews

HyperCaptive™ Air Filtration

The filtration system is the core of every air purifier. A powerful filtration technology means the product’s value is worth your money.

The Environmental Protection Agency (EPA) recommends the HEPA filter as the best system to reduce the risk of COVID-19. Airmega uses Green True Filter on a multiple-layer system to trap 99% of all indoor pollutants and sources the size of 0.01 microns or smaller.

The polluted air goes through four stages of air filtration. The Prefilter stage traps dust, hair, and other large particles. This component is washable and dries quickly. MaxFilter 2 is a combination of activated carbon and a true HEPA filter to capture smaller particles. Meanwhile, the Activated Carbon traps odors and harmful VOCs. The last stage is the Green True HEPA Filter, the part of the system that captures the tiniest particles, like viruses and bacteria.

Smart Mode

Coway Airmega 300 - Mid Size Air Purifier - CowaymegaThis feature allows the device to automatically adapt its performance according to the current conditions of the room. For instance, if the sensors detect that the indoor air is dirtier than usual, it will adjust the fan speed to clean the air faster. This means that the device can work more quickly when needed without compromising the quality.

Eco Mode

When the air improves for 10 minutes while in Smart Mode, the device will automatically go to Eco Mode. This mode will turn off the fan to avoid wasting electricity.

Sleep Mode

When the sensors recognize a dark room and the air is clean for three minutes, the air purifier goes on Sleep Mode. With this setting, the device automatically lessens the noise and power consumption.

Filter Alerts

Coway Airmega — Amina HorozicThis feature indicates when you need to replace the two Max2 filters.


If you need the device to clean the air for certain hours, configure the timer to set the limit to conserve energy.


A decent air purifier is priced anywhere between $300 and $1000. According to Coway’s website, the Airmega 400 costs $649.00, making it a mid-range item. The product is backed by a 30-day money-back guarantee, a five-year limited warranty, and free delivery.

Customer Feedback

Looking at customer feed

back on Amazon, it’s evident that most customers who bought the product are satisfied with its performance. Many customers rave about the unit’s ease of use, durability, low-noise operation, and effective removal of harmful airborne pollutants.

Customer Support

If you’re having trouble with the product, there are many ways to reach Coway’s customer service team. For general information, you can browse the FAQ page to see if there is an answer to your question. If there is none, you can call their customer care department. They are also available via email.

Coway offers free delivery on orders from the United States and Puerto Rico. The product is not available internationally, in P.O. boxes, and other U.S territories. All orders made after business hours are dispatched the next business day.

Final Thoughts

Rabbit Air BioGS vs. Coway Airmega 400 Air PurifierThe Coway Airmega 400 has everything you need in an air purifier. It is powerful, efficient, and easy to use. It has a cleaning coverage area of up to 1,560 square feet.

The device is so smart that you don’t even notice that it’s doing its job. It has a filter indicator to tell you when to replace the filters. Automated fan speed changes depending on the air quality to reduce the device’s power consumption and noise level.

The only downside of this product is the high price of its replacement filters. Other than that, the Coway Airmega 400 is a great pick.

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