Coway Airmega 400S (White)

$849.00 $749.00

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The Wi-Fi*-equipped 400S lets you control your Coway Airmega smart air purifier anywhere, anytime using the Coway Airmega mobile app, including smart mode (auto, sleep, eco) and real-time air quality monitoring. 

TRIGGER: |. | -- periodWith 1,560 square feet of coverage, the Coway Airmega 400S and 400 models offers the best air-purifying capacity and are designed to be used in larger spaces.

Note: Coway Airmega is available for purchase, shipping and use only in the U.S. at this time.

All Coway Airmega models come with two pre-filters and two Max2 HEPA filters.

*Router frequency: Your Wi-Fi router should be set to both 2.4 and 5 GHz. In the absence of 5 GHz, you can set your router to 2.4 GHz only; 5 GHz will not work alone.

Security: Your Wi-Fi security should be set to one of the following options: Open, WEP, WPA, WPAAES, WPA2AES, WPA2TKIP or WPA2.

Improve your air with a dual HEPA air purifier, thanks to Coway Airmega’s 30-day money-back guarantee, free shipping and easy monthly payment options. See details for more.

Real-time Air Quality Monitoring

Coway Airmega’s smart air purifier sensor monitors and reports air quality in real-time all day and night.

Smart Mode

Coway Airmega automatically adjusts fan and air-filtration speed for auto, sleep and eco settings based on real-time air quality conditions.

Alexa Capability

Coway Airmega integrates your Amazon Alexa products, so you can control your HEPA air purifier with your voice.

Mobile App

Available for the Coway Airmega 400S and 300S, the Coway Airmega mobile app lets you control your air purifier remotely.

Powerful Performance

Coway Airmega can change room air up to twice per hour, removing 99.97 percent of pollutants.

Filter Alerts

Coway Airmega reminds you when your dual HEPA air filter needs to be replaced, so you don’t have to check.


Room Coverage

2 air changes/hr.*
1,560 sq. ft. (145 sq. m)
4 air changes/hr.**
780 sq. ft. (72 sq. m)

Mobile App

Yes (More)


Auto Mode
Eco Mode
Sleep Mode


Washable pre-filter + Max2 filter set


Real-Time Monitoring

Filter Life Indicator

Fan Speed

Sleep, Low, Medium, High


Coway Airmega application (1, 2, 4, 8 hours)



Size (H x W x D)

22.8 x 14.8 x 14.8 in.(58.0 x 37.6 x 37.6 cm)


24.7 lb. (11.2 kg)

Noise Level

22~52 dB

Power Consumption

66 W

The coverage area of the Coway Airmega reflects the size of the area in which the air purifier can make two air changes per hour. “Air changes per hour” reflects how many times your Coway Airmega can clean a given area in one hour, assuming the ceiling height is eight feet.
*Coway Airmega can clean the area once every 30 minutes.
**Coway Airmega can clean the area once every 15 minutes.


Customer Reviews

Smart and beautiful!

Looks great, but works even better than it looks! I love the automatic operation. (show less) Looks great, but works even better than it looks! I love the automatic operation.

What a difference!

I love it! Can breath easier and there is hardly ever dust on the furniture now. (show less) I love it! Can breath easier and there is hardly ever dust on the furniture now.

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