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AIRMEGA 400S The Smarter App Enabled Air Purifier (Covers 1560 sq. ft.),Compatible with Alexa
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- Coway Airmega 400S is designed to accommodate large room sizes up to 1, 560 square feet and cleans the air at least two times per hour when used as recommended.
- Coway Airmega Max2 filter – combined activated carbon and True HEPA filter – captures and reduces up to 99.97% of particles 0.3 microns in the air, including pollen, pollutants and other allergens. It also reduces more than 99% of volatile organic compounds and reduces fumes such as NH3 and CH3CHO. It also includes washable and permanent pre-filter to catch larger dust particles.
- Coway Airmega’s pollution sensor communicates indoor air quality testing in real-time. The brightly colored LED ring lets you know how clean or dirty your indoor air is every minute of the day.
- Coway Airmega has five fan modes: Smart, Sleep, Low, Medium and High. The noise level is nearly silent at lower speeds and the max noise it creates at the highest setting is 43. 2 dB.
- Smart mode with three settings, Coway Airmega smart air purifier adapts to its surroundings. Fan speed automatically adjusts based on the room's air quality and lighting conditions to improve air quality.
- Coway Airmega has a timer with 1, 2, 4 and 8-hour settings, plus indicators for filter lifetime for both the washable pre-filter and Max2 filter.
- Coway Airmega IoCare mobile application includes indoor and outdoor air quality monitoring, filter notification, speed, and smart mode control and scheduling. Coway Airmega also works with Alexa and Dash Replenishment.
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From the manufacturer
Covers up to 1,560 square feet(400S, 400) / 1,256 square feet(300S, 300)
Air Quality Monitoring
Coway Airmega’s pollution sensor communicates indoor air quality in real-time. The brightly colored LED ring lets you know how clean or dirty your indoor air is every minute of the day.
With its Smart Mode feature, the Coway Airmega automatically adapts to its surroundings by adjusting fan speeds based on the room’s air quality. That means your unit is energy efficient without compromising efficacy.
Powerful Dual Suction
Coway Airmega draws contaminated air from two sides and pushes filtered air out the top of the unit, cleaning the air you breathe faster and more efficiently
The Max2 filter—a combined activated carbon and a True HEPA filter—captures and reduces up to 99.97 percent of particles 0.3 microns in the air, including pollen, pollutants and other allergens. It also reduces more than 99 percent of volatile organic compounds and reduces fumes such as NH3 and CH3CHO.
The easy-to-clean pre-filter captures large particles like hair, fur and dust in its micromesh, so Max2 filter can work more effectively.
The air filter indicator tells you when the two Max2 filters need to be replaced, and the pre-filters need to be cleaned for maximum efficiency, based on how much air they have processed.
Balance Of Technology And Design
By combining leading technology, inspired design, imagination and an obsession with detail, we created an air purifier that is as powerful as it is beautiful.
Coway IoCare Mobile App
The Coway IoCare mobile app, available for the 400S and 300S, delivers a wide array of unique features such as real-time air quality notifications, filter lifetime monitoring, and scheduler. It also works with Amazon Alexa and Dash Replenishment Service. Enjoy the freedom to control your unit, anywhere, any time.
|400S Graphite||400S White||400 Graphite||400 White||300S White||300 White|
|App & Alexa & DRS||Yes(IOS, Android)||Yes(IOS, Android)||-||-||Yes(IOS, Android)||-|
|Coverage||1,560 sq. ft.||1,560 sq. ft.||1,560 sq. ft.||1,560 sq. ft.||1,256 sq. ft.||1,256 sq. ft.|
|Filters||Washable Pre-Filter+Max2 Filter Set(Activated Carbon+Green True HEPA)||Washable Pre-Filter+Max2 Filter Set(Activated Carbon+Green True HEPA)||Washable Pre-Filter+Max2 Filter Set(Activated Carbon+Green True HEPA)||Washable Pre-Filter+Max2 Filter Set(Activated Carbon+Green True HEPA)||Washable Pre-Filter+Max2 Filter Set(Activated Carbon+Green True HEPA)||Washable Pre-Filter+Max2 Filter Set(Activated Carbon+Green True HEPA)|
|Pollution Indicator||Yes (4 Levels)||Yes (4 Levels)||Yes (4 Levels)||Yes (4 Levels)||Yes (4 Levels)||Yes (4 Levels)|
|Filter Life Time Indicator||Yes||Yes||Yes||Yes||Yes||Yes|
|Fan Speed||Sleep, Low, Medium, High||Sleep, Low, Medium, High||Sleep, Low, Medium, High||Sleep, Low, Medium, High||Sleep, Low, Medium, High||Sleep, Low, Medium, High|
|Timer & Scheduler||Timer 1, 2, 4, 8 Hr & Scheduler||Timer 1, 2, 4, 8 Hr & Scheduler||Timer 1, 4, 8 Hr||Timer 1, 4, 8 Hr||Timer 1, 2, 4, 8 Hr & Scheduler||Timer 1, 4, 8 Hr|
The most advanced air purifier developed by Coway. Air mega is a connected air purifier, that intelligently, effectively and quietly cleans the air in your home. Its dual-filtration system removes 99.97percent of particulate matter from the air, while the accompanying air mega mobile app (IOS and Android) allows you to monitor and manage air quality from almost anywhere.
Room Coverage 2 air changes/hr.*: 1,560 sq. ft. (145 sq. m) 4 air changes/hr.**: 780 sq. ft. (72 sq. m)
Filter: Washable pre-filter + Max2 filter set
Noise Level: 22~52 dB
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|Sold By||—||Amazon.com||AGT GLOBAL TRADING||Amazon.com||Amazon.com|
|Item Dimensions||14.80 x 14.80 x 22.80 inches||14.80 x 14.80 x 22.80 inches||8.70 x 8.70 x 14.20 inches||16.81 x 9.57 x 18.31 inches||15.00 x 8.20 x 23.60 inches|
|Item Weight||24.70 lbs||24.70 lbs||—||12.35 lbs||15.40 lbs|
Top reviews from the United States
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Automatic Night Mode: Unfortunately one of the primary reasons I purchased the 300S model was for the light sensor that would automatically enable night mode when the lights went out. However, the table in the description incorrectly lists the 300S model as having that light sensor. Only the 400 and 400S models are able to automatically shift into night mode when the lights are turned out. However, on the 300S you can schedule the night mode to turn on at a designated time.
Air Quality Recording Resolution: A great feature of the S models is their ability to monitor and record the air quality of the room that the filter is placed in. Unfortunately, however, the recording feature doesn't work very well. The in-app historical chart showing the air quality over the course of the day is shown as a smooth line plot, with time on one axis and air quality on the other. I have found that the historical chart regularly displays the quality of the air as always very good and shows little variation in the quality, despite the real-time status of the air quality regularly spiking into the 'very poor' range due to my use of aerosols in that room. It seems as though the historical chart averages our the air-quality and smooths out the spikes so much that I have never seen the historical chart show anything outside of the very good range. In my opinion this significantly diminishes the usefulness of the feature. I also own a Dyson air purifier with an air quality sensor and I have found the historical chart for that device to provide a historical chart of air quality with much greater resolution.
Air Quality Recording Delay: I have found that there is always a delay of about one hour on the in-app chart between the most recent quality reading displayed and the current time. This lag is also present in the Dyson that I own. I suspect that it happens because the air purifier sends only one datapoint to the Airmega servers once every 30 minutes or so, and that it takes a while before that data point is pulled from the servers to the app on your device. Not a big issue here though because the historical recording is basically useless.
Scheduling: The only reason I would purchase an S model is if the scheduling feature is important to you, or the ability to control the device while you are away from home. One of the few nice things about the S model is that you can create a schedule for the device, directing it what setting to be on (Night, Auto, Low, Medium, or High) and whether you want the light ring to be on. It's great because you can create a different schedule for every day of the week. The only problem with the scheduler is that if you schedule it to run on night mode from 11pm until 8am, for example, at 8am the device will shut off instead of resuming the state that it was in prior to 11pm. Effectively this means that if you want to schedule it to be in a particular state during a particular time, you must create a schedule for it 24/7. Otherwise it will simply shut off at the conclusion of that scheduled activity. Personally I would recommend buying the 400 or 400S and leaving it on automatic night mode all the time--it will stay in automatic during the day and switch into night mode when the lights are turned off so long as the air quality is good.
Reasons Why This is a Great Product
Noise Level: I have this placed in my bedroom, so the noice that it creates is a principle concern for me. I have found that so many products are either too loud on their lowest setting or don't produce sufficient airflow to be effective. On Low or Night modes, this device operates silently. You cant hear that it's running unless the room is pin-drop quite and you put your ear right next to the device. Surprisingly even on low and night modes it does produce a good amount of air flow. Much more than the comparable Blue-Air and Honeywell devices that I have owned in the past. Personally I have begun setting the device on Medium while I sleep because it still is fairly quiet and I have come to appreciate the bit of white noise that it produces.
The Filters: The filters that the Airmega uses are clearly very high quality. I don't have much more to say about them other than when you pick one of the filter up, you can just tell how well made they are. This device also has a pre-filter which I greatly appreciate much more than I had expected. I purchased this to reduce the amount of dust in my bedroom and the pre-filter does a great job filtering out a good portion of the dust. It is made of a super fine fabric mesh that I vacuum off once every couple of weeks. I'm glad they designed this with a pre-filter because I am sure that it will greatly extend the lifetime of the filter and help maintain high airflow through it. I have noticed a substantial reduction in both the amount of dust in my bedroom since buying this purifier, and the severity of my allergies.
The Build Quality: Again it's hard to explain this one, rather it's something that comes intuitively after interacting with the produce. This device is both very stylish, thoughtfully designed, and well built. Attention to detail is evident in much of the design and oozes quality--down to even the braided nylon encased power cord. When you buy this air filter, you too will be impressed by how well this product is made.
In conclusion, I have given this product four stars. Despite the inaccurate description on the product page for the auto nighttime sensor, and the rather poor air quality history and scheduling experience (why I deducted one star), the fundamentals of this air purifier are phenomenal and I would still highly recommend it to anyone who is hesitant on the price. It is an expensive product, no doubt, and it was painful for me to shell out this much money for an air filter. But, with this product you really get out the quality you pay for--unlike with the Blue-air products where you pay for just the aesthetics. Amazon has a generous return policy, so I would encourage you to try it out if you are hesitant with the price. But be warned, you're going to love it and wont want to send it back.
I have this unit placed in our main living room where the family spends the most time in an effort to help my wife with asthma symptoms which have worsened over the past 6-9 months. In the past I have been skeptical of the effectiveness and need for air purifiers (my wife has not had any real symptoms for years), but since installing the air purifiers (I now have this unit, plus 1 other brand in the master bedroom and yet a different brand upstairs) my wife has been breathing easier and with less need for her inhaler medication. So now I am a believer.
When evaluating air purifiers, I looked closely at the published air flow rates vs sound level for each fan speed. My goal for this unit was to have constant air purification with noise levels that would not be too obtrusive with normal conversation and TV viewing in the living room. For air purification to be effective there must be an adequate number of air changes per hour (ACH) at whatever fan speed you can tolerate. Based on my research, the recommended ACH seems to be in the 4 to 6 air changes per hour range for effective particle reduction. (FYI: the Blueair website has a Performance Book that has a good graph of room particle reduction vs air changes per hour that shows that around 4.5 to 5 ACH the particle reduction is around 90% and the point of diminishing returns has essentially been reached.) My filter placement is 4-5 ft behind the couch, so my preferred noise level is 48-50 dBA or less while watching TV, etc.
Airmega only publishes a noise range of 22-52 dB (which I assume is dBA) for the 400S and room coverage of 1560 sq ft at 2 air changes per hour. The Airmega published room coverage data (based on 8 ft ceiling height) lets you calculate the maximum air flow as 416 cfm at the highest speed, which is a pretty decent rate when compared to other premium air filters. I have checked the 400S operation with an iPhone sound level app (NoiSee) and a portable anemometer and measured the following data for the fan operating range:
Sleep 64 cfm 22 dBA (this is essentially silent and that is actually Airmega noise value - the app won't read that quiet)
Speed 1 115 cfm 32 dBA
Speed 2 286 cfm 46 dBA
Speed 3 427 cfm 54 dBA (slightly higher than Airmega "Certified" level - but they don't specify dBA scale)
For me these operating characteristics work quite well. Our living room is roughly 337 sq ft, so at Speed 2 we get a continuous ACH of 6.4 and a sound level that is perfectly tolerable. My operating schedule is to have the purifier at speed 2 from 5:30am to 11:30pm, then run at speed 3 from 11:30pm until 5:30am for maximum cleaning during the night while everyone is asleep. Hopefully I am drawing some air from additional rooms at the high speed since the living room is open to other areas of the house of course.
I find the quality of the 400S quite good. The housing is plastic of course, but it is a good thickness and quality. The unit is reasonably sized and aesthetically pleasing, although for me the looks are secondary to functionality and performance. The 2 HEPA filters fit snugly into the housing and have a foam seal around the filter perimeter to ensure that all air passes through the filters with no or minimal by-passing. The filters also have a thin layer of activated carbon for some smoke and odor reduction, but I am a bit skeptical how effective that will be due to the carbon layer thickness. Fan operation is very smooth and I like the air flow pattern of the 400S, drawing inlet air into 2 sides through 2 separate filters, then discharging clean air upwards toward the ceiling. This achieves 2 things - there is minimal draft produced so you do not have air blowing on you constantly, plus the clean air is forced to the ceiling where it can travel across the room, circulate down the opposite walls, and sweep air back towards the unit for more effective cleaning. The dirty inlet air and clean discharge air flows are also separated as much as possible, which should reduce the amount of short-circuiting of clean air back into the unit which in my mind should increase the overall cleaning effectiveness. The unit could be quieter if the discharge air outlet were a bit larger, but that would also make the unit bigger and reduce the outlet air velocity thus reducing the effectiveness of the air flow pattern stated above. This unit seems to have a good compromise between quietness and air flow.
The controls are intuitive and on the 400S are touch sensitive. The lighting of the unit does not concern me in our application, but can be turned off in a bedroom application. The filter operation lights are on top and should not be a problem, but the air quality light is fairly large and could bother some folks. Other reviewers are correct in that it chimes with every operation and I have not found a way to silence it, so that may also be a consideration in a bedroom application. I have not tried the Sleep or ECO modes - mainly because of room placement, but I also want the purifier to be actively cleaning the air at all times. A plus to me is that the air quality light continuously shows the measured air quality while in manual speed control operation, not just while the unit is in Smart Mode to adjust fan speed based on air quality. I guess I should really test that function just to ensure correct operation with my unit for possible future use, but I am sure it will work fine.
The iPhone app took 2 attempts to initially connect with the 400S, but since then has operated flawlessly - but it has only been a week. I have the app installed on my iPhone and iPad Mini 2 and both are running iOS 10.2.1. The app could use a bit of work in that it does not appear to be connected at all with the Airmega website even though I use the same email address for both. I entered my registration information, including place of purchase, purchase date, model & serial number of purifier, etc. in the iPhone app and got a message that the info was successfully transmitted yet my account on the on-line website gives no indication that I have a registered unit nor does it have a way to enter that information. It only has a section to show orders made directly through Airmega. I guess that I will have to make a phone call to Airmega to confirm registration and that my 5 year warranty is in force. A bit of an unnecessary hassle.
The app functionality is OK. You can perform basic manual control (power on/off, lights on/off, check filter life). It also has a section to set up an operating schedule. I have mine programmed to set the unit to fan speed 2 every day from 5:30am to 11:30pm and change to fan speed 3 from 11:30pm to 5:30am on Sunday thru Thursday (I left Friday and Saturday nights off that schedule since we may be watching movie, etc. later than on work nights). I found that when the unit is operating by the schedule function you have to define every hour of the day or else the unit will power down during undefined times. For example, the above schedule did not define operation on Friday or Saturday night after 11:30pm so the unit shut down at 11:30pm. I intended for the unit to continue at fan speed 2 after the daily 5:30am to 11:30pm schedule finished, but instead it powered down. So I had to enter a 3rd schedule to operate at fan speed 2 from 11:30pm to 5:30am on Friday and Saturday night.. Not a big deal. So far the scheduled operation has performed without fail. And contrary to some other reviews, if the app does not work then the only real loss is the scheduling feature and air quality data logging. All of the basic functionality of the unit can be controlled on the unit itself manually.
Other useful features of the app is to set the Smart Mode air quality measurement sensitivity (high, medium (default), low), set pre-filter wash frequency notification time (2, 3, or 4 weeks), set time zone (for schedule operation presumably). You can also set up notifications to your phone for filter life milestones (pre-filter life reaches 0%, HEPA filter life reaches, 10%, 5%, 0%), for Indoor Air Quality alert (level reaches "Very Unhealthy"), and any system errors or failures.
The app also logs the Indoor Air Quality measurements continuously and the data can be displayed on a circular graph that give % of time at each level, or displayed on a standard Air Quality vs. time line graph. You can display 4 different time spans - the last 24 hours, last 7 days, last 30 days, or last 12 months. One thing that confused me at first was that in the "last 24 hour" view the line graph shows spikes in air quality (poor quality is higher on vertical scale), yet when I look at the "last 7 day" view their is only relatively low spikes shown. That is because the 7 day, 30 day, and 12 month views display the average air quality. Since the air quality is usually "good", the daily average shows just moderate excursions. I guess the utility to this section of the app would be to possibly identify any recurring patterns of poor air quality that could be tied to events one could change (if your air quality is primarily good). Or it could prod one for indoor changes if air quality is routinely not so good. Otherwise it is just interesting information.
I know this has been long and rambling, but hopefully helpful to some. All things considered, I find that this purifier will suit our needs very well and is a keeper. It has good air flow / noise levels, the HEPA filters seem to be good quality, HEPA filters seem to be on-track for approximately 1 year life based on my operating schedule (I am at 98% life left after 1 week), good overall size and aesthetically pleasing to me, and Coway is a long time South Korean manufacturer with good track record for quality products and product support. Only time will tell on the overall quality and longevity of this particular model.
But this is the S model, which features connectivity for an increased price. And the absolutely horrendous app is why you should not buy this.
When I first received the purifier, Coway was using a dedicated AirMega app to control functions, including scheduling, manual controls, graphic history of air quality, etc. This app was fine, with my only (minor) complaint being that sometimes it took a little long to connect to the purifier. This week, all that changed. Coway rolled out a new app. This app is sloooooow and downloads unspecified updates every time you launch the app. There is no way to view schedules, and the current mode indicators are not on the same screen as the controls.
There are so many other problems with the app, it’s not worth listing here. I have detailed them with Coway, who has been unresponsive to these complaints. I cannot stress enough to avoid the S models of this purifier. If you want flexible scheduling, look elsewhere.
Top reviews from other countries
Collects a lot of dust out of the air. It monitors both filters in percentages, so when you get to 0% maintenance is required. For the pre-filter that mean it needs a cleaning which is usually a good vacuuming or you can wash them off. For the main filters it would be a replacement.
The air feels lighter and smells better after this has been running. The air the comes out is slightly cooled if anything.
Has a side bonus of being the first device in the house to issue a warning of an unstable wifi connection...
All in all, love it and will get another one for upstairs.
Build quality is fantastic, it moves a lot of air through it, on the low settings it's super quiet (and still move good air).
I was able to connect it to my AmpliFi mesh network no problem, I didn't have any of the connection issues others have
The scheduling works very well. There's a very small bug in the scheduling if you are trying to do things specific (too long to go into it in the review). But I have been in contact with Coway and they are working on the fix right now.
Their customer support is amazing, fast replies and very friendly.
The sensor works great. The 1st one we got is in the Master bedroom, so once we start making the bed in the morning it will sense the "dust" coming off the bed and will kick into medium speed. Even just moving around it will sometime kick it into medium because you are kicking up dust from the carpet (which can hold a lot of dust). So it knows when the air isn't 100% perfect.
We liked it so much that we purchased a 2nd 400S for our Living Room/Kitchen (open concept house), we have 2 indoor cats (that don't go into the bedrooms). And a 3rd (300S) for the basement to go beside the cat litter box.
We went with a 300S for the basement because of the light sensor on the 400S (300S has no light sensor), it's dark in the basement and the 400S would stay in Sleep mode all the time, which is not what we want, we want SMART mode all the time in the basement.
I believe Coway is also working on the ability to disable the light sensor on the 400S through the app, but it's not available yet so we went for the 300S.
I don't use the light sensors on the 400S either, I have the schedule turn them completely off during the night because in sleep mode they move a tiny amount of air (to be extremely quiet), not enough to really do a lot in our house, so there's no reason to keep them on. If you have really bad air it's probably good to have them keep working even at a reduced capacity, but our air is pretty good, I just wanted them to help with some of the dust and also a way to monitor my indoor air (through their app).
Very happy with them so far.
Judging by the app's 1,4 out of 5 star rating on the iPhone App Store and reading the reviews there, I am not the only one experiencing this problem.
The other reason we got the Coway is to rid the house of the scent of the wildfire smoke that settled in our area for a month during each of the last two summers. We hope to never have another occurrence of that, and if we do it won't be until next summer, but I'm pretty confident the unit will do the job if the smoke returns.
We also had a friend over a few nights ago who is allergenic and really notices air quality. In the middle of an unrelated conversation she remarked that the air in our home seemed really clean. The impressive part is that she was sitting right beside the blazing woodstove at the time. When I showed her the Coway, she was so impressed that she ordered one the next morning.