Coway - Airmega 400S

I feel like having an air purifier that's bigger than the coverage of my space gives me a lot of peace of mind when it comes to air quality. Like i know the appliance is powerful enough to take on more my current square footage so it feels like my air is extra clean. I have the 400s and it connects to the app so i can control the air purifier from anywhere in the house, it's pretty cool.

The Airmega 300/300s is almost the same design as the Airmega 400/400s, but the 300/300s has a lower CFM than the Airmega 400/400s. So if you like the design and functionality you may as go for the Airmega 400/400s if you have space for it, it's like the size of a small mini-fridge/hotel mini-bar.

The Coway Airmega 400s is a good choice for the "Great room". You can measure the effectiveness using an air quality monitor. Later you could think about adding 3x Coway Airmega 250s. One in each bedroom and one in the Den. But you don't need to install them all 4 air purifiers once. I would think about adding one at a time until you get the situation under control.

The Coway 400s is a good size for filtering the great room. They would later need to add 2x additional air purifiers for the two bedrooms and 1x for the den. Hopefully they have an extractor fan for the kitchen.

It's a funny inconsistency. [Energy Star says the Coway Airmega 400s has a smoke-free CADR of 328 CFM](https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjXuOu49pCGAxXOhf0HHTIRAYgQFnoECCgQAQ&url=https%3A%2F%2Fwww.energystar.gov%2Fsites%2Fdefault%2Ffiles%2FRoom%2520Air%2520Cleaner%2520Draft%25201%2520Version%25202.0%2520Data%2520and%2520Analysis_0.xlsx&usg=AOvVaw0G-z9wF5ZtF2Gu3KSm1rqA&opi=89978449), but they say the Coway Airmega 400 (without the "s") has a smoke-free CADR of only 285 CFM, even though the two products should be similar if not almost identical they are listed with quite a discrepancy by Energy Star. Maybe an inconsistency from testing different batches of the product, not an actual difference between the products. The Coway Airmega 400 is a nicer product compared to the BlueAir 211i, Oransi mod+ and Levoit core 600s. Although opinions about its appearance can vary.

I like Coway. Silent, dealt with wildfire smoke perfectly.

I recommend Coway. Just make sure you are paying attention to the sq ft coverage.

Coway 400S. Best air filter we have ever owned. We have 4 of them in a 4000+ square for house where we foster cats (10+ at any time,) and the amount of fur, dust, and general particles it filters out is amazing. Friends who are severely allergic to cats come over with zero issues with these filters running.

[link to them on Amazon](https://a.co/d/iQKjYKh) Unfortunately, we got ours on Amazon - we’ve been trying to avoid buying from Amazon after Bezos decided to censor his newspaper (New York Post,) but regardless, these machines are built extremely well. I do not know the specifics on warranty, but we have had two of them for more than six years and two more for more than four years and zero issues with any of them - we just change the filters about once a year and vacuum the filters every other month of so - they pick up a mind blowing about of debris from the air and floor of your house - I’ll find large pieces of cat toys (feathers) that (after deduction and piecing things together,) tracked that the debris travelled over several rooms and through doorways over time to get into the outer filter where the big stuff sits to be vacuumed out. 100% Will buy another if something happened to one of ours, which I am assuming will be an accidental incident and not breakdown mechanically - as I said, they are very well built. Edit - looks like a 5 year warranty, but as you will see if you get one, well made and not simple in the way that makes it really well built - fewer, and higher quality parts.

I’ve been drowning in dog and cat hair until I got a Coway Airmega 400S. Its true HEPA filter grabs fur and dander, and the activated carbon core neutralizes pet odors.

FYI: the fan on the microwave can still help, there is usually a carbon filter that will need periodic replacement. I just placed a Coway 400s next to my 3D printer. The carbon filter definitely helps when I am printing ABS filament. I also have some older 6 fan Shark towers that are now discontinued. They don’t have carbon filters, but still helped a great deal when cooking. For my Cuisinart electric grill, I have a smaller Shark cylinder next to it. When I grill salmon it quickly goes into low air quality (red) mode. The other units on the first floor (two Shark 6 fan towers) also go red and max filtration. Bottom line is that I find air filtration works well, but it does take some time to exchange enough air to reduce the cooking odors. Maybe a half hour with 2 large and one small unit running in auto mode. I think that two well placed Coways would probably exchange enough air to eliminate the odors fairly quickly. Put a smaller unit in the kitchen on the countertop near the stove for even more air exchange.

Yeah Coway Airmega works so well. I have S400 and it's been fantastic.

I love our coways too.

I have 2 Coway Airmega 400s. They are absolute beasts for high CADR hepa, and do include a solid size carbon filter option that you can add. They really work for pets.

I absolutely love this air purifier. Totally recommend. I brought it with me on a week vacation where we were renting out a house. One of my kids had problems last year and felt like they had a sore throat and headaches the entire time we were there so I figured I'd give it a shot this year. Holy moly. As soon as we turned it on in that house, the light went red and it ran nonstop for hours. I downloaded the app to see what was going on and the particulates in that house were super high. We left the house for a few hours to let it work and it greatly reduced the particulates in that time. By the next morning, all was back to green. My kid didn't have respiratory problems that year. After that, I'm a firm believer, especially since it never acts like this in our house.

This is the answer. We have 2 and my battered lungs instantly told me they were a good buy. Quiet too except when there is cooking fumes in the air.

I use an IqAir GC, Coway Airmega 400s, and Coway Ap1513. I have invested in these over the years and bought them from wholesale or second hand. They are all heavy-duty purifiers, but anything with a hepa filter will do. Make sure if you are on multiple floors... air purifier on each floor. Make sure it's double the sq.ft of the area you want to filter. If it's not enough.. double up.

Coway makes amazing all around units. We have two Coway 400S, in fact they are some the first units we ever bought. Shoot me a chat request and my wife and I will gladly help you pick an air purifier.

I highly recommend coway. I think it makes a difference since filters are covered in dust

Mine is a few rooms away from the kitchen and it detects dirty air and kicks into high speed when I cook.

I bought a used Coway Airmega 400S for $200, that came with a brand new set of OEM filters, the best purchase ever, and large enough to quickly cover 700 sq ft space in about 15 min for a complete air exchange. CADR (Clean Air Delivery Rate): 328 (Smoke), 328 (Dust), 400 (Pollen) Really love how quiet it is and the air monitoring report and air quality sensor. I've had a home improvement project going and as soon as dust started flying the air filter on auto setting cranked all the way to the max to counter. The over 350CFM air flow pushes a massive amount of air on max and surprisingly it's not even as loud as my old Holmes HAP756NU at medium setting.

I agree with Coway. We have one near our kitchen that filters out cooking smells quite well. Somewhat proof that it works!

I rely on the Coway Airmega 400S for my dogs because it traps fur and helps with pet smells without getting too noisy.

Another vote for Coway. I have pretty bad dust and pollen allergies and am lucky enough to be able to sleep in a separate room that no one else goes in. I think I just dusted for the first time in a year, the rag was only a little dirty. They are pretty sensitive to any sort of oil-frying/sauteeing in a pan, making fried rice sends it scrambling (we have a second machine near the living area.) I prefer to crack a door for a few minutes to replace the air rather than wait for the machine to filter it.

I have two of the Coway ones (the $200 ones, which seem to go on sale fairly regularly) and it helps my seasonal allergies quite a bit.

My daughter has asthma so we run air purifiers in several rooms in the house, it seems to help a lot. We have Coways and Levoits but if I was starting from nothing I’d run all levoiits.

Ive had a coway since before covid and it’s excellent.

\+1 - I have coway's and have been pleased with their performance thus far. I also vacuum around the dog pen to collect hair and I haven't had much smell other when they come in from being outside.

selling my conway 400s if anyone in ny tristate area on fb market .. upgraded to something stronger to put in my cigar room I'm currently building

would be worth cross-referencing with this thread: https://www.reddit.com/r/BuyItForLife/s/iG0y1wJ4JO there are also a couple other almost identical asks if you search reddit. different communities might highlight different strengths. i’ve been real happy with my Coway Airmega 400. the S model is “smart.”

I just bought an air mega 400s with $350 off on sale from coway. So far so good

For most applications, Coway has the best build quality of the brands here. I should also mention Blueair, [which offers a 5 years warranty with registration for certain models](https://www.blueair.com/us/warranty.html). All Blueair purifiers utilize an always-on ionizer to electrostatically charge the filtration media. While I'm not quite certain on comparisons, Smart Air's Blast and Blast Mini air purifiers might be similar in quality or greater to Coway's higher-end Airmega purifiers. But those two Smart Air models are expensive. For the [Coway Airmega 300/300S, 400/400S, Icon/IconS\*, and ProX models, the warranty period is 5 years](https://cowaymega.com/pages/warranty-registration). \*We don't recommend the Icon or IconS models as they're poor value for money.

Levoit core 600s, coway airmega 300/400, medify ma125, dyson tp10, alen air breath smart, winix t810/5500. Any of these are great, so you can pick based off of design preference and location. Ones that intake from all sides work best in center of room, others are fine up against a wall. Dyson works well as a fan or circulator too. I also live in a larger open air loft style apartment with a cat. I have a Dyson in the upstairs bedroom for the fan feature, levoit 600s in kitchen for cooking because that thing moves alot of air at max, winix 5500 in bathroom and by litterbox because it is best bang for buck, having carbon pellets for odor at low price.

Sigh. Listen, offhand all I know of is the Coway AirMega series 250/300/400. But seriously, please see other responses - you need to remediate the Asbestos.

Coway and BlueAir are great. Make sure it says "True HEPA," unless you build a corsi-rosenthal box Levoit ones aren't always true hepa.

Coway room aipurifier is amazing. We have it in our bedroom. Though our area is quite clean it does remove dust and fungal odour during winters