The Filters for this 400 filter sold here and on Amz are bad. Conway you know these filters are bad. They leach stinky chemical smells into your house. AND YOU ARE 100% AWARE OF THIS ISSUE.. This issue Affects us the good customers that make up your profit revenue stream. Most people never notice because they have other pleasant smelling fragrances covering up the stink of the Coway filters. I have 2- blueair 211+ and 1 Bissell air 220 both filters also use carbon. SO its quite easy to smell my Blueair 211+ and my Bissell air 220 and then I smell my Coway and it's disgusting. SHAME ON YOU COWAY FOR TRYING TO SILENCE THIS ISSUE AND HOPE NO ONE NOTICES IT! You sell one of the most expensive air filters that is nothing more then a show piece because it stinks up your house with a chemical smell. The ignorance of you! American people do not appreciate ignorance like you display as a company turning a blind eye to this issue. Take the hit and fix your garbage filters. All the clone filters have the exact same chemical stink.

If you didn't know. Now you know! Coway is ran by people who are helpless. They do not respect american's and are money spent. In a sense they are stealing from you.

The first year we had our 400S, it detected air quality quickly and responded to change fan speeds as needed, but, after
a year, with a very routine cleaning including cleaning the sensor and intake/exhaust ports, automatic
refuses to adjust fan speed based on air Quality. Fan stay at 1 100% of the time even though Sensor/detection is set to max (Sensitive).

Our 400S now stays on low no matter how bad the Air really is. Our other non-Coway Air Purifier responds immediately
to poor air quality, but, now the only way to use out 400S is fully manual. Coway's warranty requirements won't allow
warranty coverage since they say if you blow into the Sensor area at clse range and it responds, the 400S is ok.
Wrong! Of course blowing directly into the Sensor area will trigger a change, but, that does not mean, the sensor/smart system is
working correctly for monitoring normal air quality in the room. The 5 Year warranty seem useless to us and we
have a 400S that is now not sensitive at all like it used to be, even set to max/sensitive settings. Manual operation is the only way to
get the fan into higher speeds now.

Looks good and quiet. Self checks air quality in smart mode and adjusts fan speed acordingly. Fan stops when the air quality remains good for 10 minutes. Fan starts when bad air quality is detected or after 30 minues. Air quality indicator is prominently displayed in front using color code. This unit has indicators to let you know when the prefilter needs cleaning and when the carbon/hepa filter needs changing. Unit setup was a breeze. Wifi and mobile app setup was easy and without a glitch! This unit has been setup in my living room. I plan to get another Coway air purifier for my bedroom. I was first impressed by a Coway air purifier in my in-laws living room. I'm glad to have one in my living room now. I highly recommend this product.

I live in an approximately 1200 sq. foot apartment in a VERY high traffic suburban area. The building was built in the early 1970s, and has not been upkept the greatest. There have been ventilation issues, ongoing construction issues, and several floods over the past 11 years. I'm positive there is mould in the drywall behind the walls. Building management isn't likely going to do anything about it. Therefore, I decided to purchase a Coway air purifier after reading numerous reviews on various websites - including Consumer Reports, which I am a member of. So far, I have not been disappointed. The air quality in my apartment is much better than it was, the Airmega 400 is reasonably quiet (except at the highest fan level - then it's a bit noisy) and I'm very happy with my purchase.