Seeing an air purifier in someone\u2019s house has nowadays become more of a normal occurrence than a rare find, and this is because more and more people are becoming aware of the increased amount of air pollution that is causing a significant decrease in most people\u2019s indoor air quality. As a result, units such as the Coway Airmega 400S are becoming a lot more popular, and with a room coverage of up to 1560 Sq ft, it could easily be the best air purifier for anyone that\u2019s got a large room. Could it also double up as the best smart air purifier? Well, it does have some smart features of its own, but not enough to feature at the top of that list. If you\u2019re still curious, get to the end of this review to see what else it\u2019s got in store.\r\n\r\nWhy We Like It - Airmega 400s\r\nThe Airmega 400S is a powerful air purifier that will very well work in large rooms of more than 1000 square feet, and thanks to its support for WiFi connectivity, it allows for remote operation through your smartphone.\r\n\r\nPower\/Speed\r\nThe Airmega smart air purifier relies on a 3 stage filtration system to clean your air, where it uses a pre filter to trap any large air particles, a True HEPA filter that deals with allergens that are up to 0.3 microns in size, and a carbon filter that eliminates bad odours from the air. It\u2019s filtration system may not be as elaborate as that of the Rabbit Air Minusa2 Air Purifier, but it\u2019s HEPA air filter set makes it pretty much efficient as it is able to clean the air for up to two times an hour. Also worth mentioning is that the unit features 5 different fan speed options, giving you a range of choice for how you\u2019d want it to operate.\r\nEfficiency\r\nTo facilitate up to 2 air changes per hour in a large room of over 1000 Sq ft, the Airmega 400S will only need about 64 watts of electricity. Such a low level of power consumption is the reason why it\u2019s got an energy star certification, and this makes it a more economical option compared to the Bissell Air Purifier. To save even more money in electricity costs, you could opt to have the unit run in smart mode, where it\u2019ll use its air quality sensor to determine the best settings, or run it in sleep mode, where it\u2019ll operate at its quietest.\r\nVersatility\r\nYou will be able to connect to and operate the Airmega 400S through a mobile app thanks to its support for WiFi connectivity, and this ability adds a couple of advantages to it that you will not get to enjoy if you were to opt for the Coway Airmega 300. Some of these advantages include getting a reading of the real time air quality wherever you\u2019ve placed the purifier, and also knowing when it's time to replace its Max2 filter set.\r\nDurability\r\nLike most Airmega air purifiers, the 400S is backed by a generous 5 year limited warranty, so you should have no reason whatsoever to doubt its ability to function well & ensure that you enjoy clean air over the long haul. The unit also boasts of good build quality, top notch HEPA filters, and features a sleek control panel that\u2019s pretty easy to get around.\r\nValue\r\nThanks to support for WiFi connectivity, you\u2019ll easily be able to integrate the 400S into your smart home setup, and be able to use Alexa for example during voice control. Even if you don\u2019t go ahead and connect it to your phone, you\u2019ll still be able to know when it\u2019s time to replace the Max 2 filters since the unit has got a filter indicator on its control panel.\r\nAirmega 400s Wrap Up\r\nGoing by the many customer reviews that have been left by satisfied customers on its Amazon page, the app enabled Airmega 400S is pretty much a great option for anyone that\u2019s looking to enjoy seamless operation, from a unit that\u2019s built to last.