Are you considering the Coway Airmega 300? There are various reasons why you may need an air purifier. The brand and make that you choose is determined by several various factors. 

There has been a lot of conversation around the importance of an air purifier. After all, many people do not use them. But this is not enough reason to not give new ideas a try.

You may be wondering what an air purifier will do for you, or perhaps you may want to replace your current air purifier. Regardless of why you are searching to know more about different air purifiers, there are a few things that you will need to look out for. 

Coway Airmega 300 Smart Air Purifier

The reason that air purifiers have become a big part of people’s lives today, is that access to clean air is an essential part of human health. The same way that clean water is a basic human necessity. 

A good air purifier cleans the air out for you and makes it safe to breathe in. Air pollutants are not only found outside, but they are also part of our daily lives indoors. We cook, we clean, we spray deodorants, and also have pets amongst other things. 

Purifying Mechanism

Coway Airmega 300 Smart Air Purifier front image

The Coway air mega 300, is an efficient air purifier, that makes use of various smart features to clean the air. It draws the polluted air from two sides and pushes this air out of the top of the unit. 

This air purifier uses a three-stage air purification process, which is a pre-filter, activated carbon filter, and a HEPA filter. What it does not have, is an optional ionizer, a UV light, or any other filtration. This makes it safe for the ozone.  

The primary filter is made up of a true HEPA filter that has an activated carbon filter. This is called the Max2 filter. With these filters, 99.97% of particles that have a micron size of 0.3 are filtered.

Whilst 96% of VOCs and gases are trapped. They do a great job of removing odor in the air. The pre-filters can be removed and washed.

The filters will last you about a year, and replacing them will cost you around $65.

The dust in our homes consists mostly of dead skin cells. This means that your home has a lot of pollutants in the air, and it does not mean you do not do a good job of cleaning, but there are just some things that your regular cleaning methods cannot get rid of. 

Allergens and odor easily get past these. But a good air purifier will get rid of allergens in the air. 

The Coway air mega 300, has a specific design that reduces up to 99.97% of particles that are 0.3 microns in size. It is a powerful purifier that can clean a large room up to 1 256 square feet. 

It also reduces fumes. So if you live with a smoker or you have odors and gases in the home, that you do not want to be inhaling, the Coway air mega 300 is a great buy.  A combination of its powerful filtration system and other cutting edge features, see to this.

 Let us take a look at all the other features that you get with the Coway air mega 300 air purifier.

What we like

We like that it has smart app features and a great filtration process. The design and construction of the unit are strong and it can cover large rooms, making it a great buy for offices and big spaces.  When you compare it with previous designs, it is easy to see the improvement.

What we don’t like

The Coway air mega 300 is a great air purifier but it is not without its faults. The mobile application has gotten negative reviews. Whilst you always have to take these with a pinch of salt, you still need to consider them. 

The filters are expensive to replace and this can be a challenge. Another disadvantage is that it is one of the most expensive air purifiers, even though it is marketed as the cheapest purifier of its range. 

We also do not like the fact that it is quite expensive to run when it comes to power consumption. To avoid surprises, You can factor this cost in when you are buying it, knowing that you will have an added power bill every month.


Don’t have much time and you want to know what questions to ask when you are buying the Coway air mega 300 air purifier? Ask about the filters. 

This is important to know what type of system the unit uses to clean the air and also if it will need to be replaced. If so, how often. This helps you figure out the total cost of running it and also how sustainable it is. 

Some air purifiers can be cheap to buy, but the filters and other replacement parts need constant replacement, making it expensive to maintain. 

Also, ask about the room size it can cover and make sure that it matches where you will be using the air purifier. Find out also, how you operate the purifier, and if it is something that you can understand. 

Whilst it may seem very superficial, it helps to make sure that the look of the air purifier ties in with the rest of the room you want to put it in.

The general design counts a great deal. Remember to also check out user reviews online or ask people who have used it how it has worked for them.

What is the noise level on this air purifier?


The Coway air mega 300 air purifier, is a smooth and quiet machine. You will not have any problems with the unit keeping you awake at night as you try to sleep. The noise level is between 22 and 52 decibels. At its lowest speed, you barely hear it run.

Cost of Running

The Coway air mega 300, is the cheapest model in its range. But it is important not to mistake this for being cheap in quality. It still offers plenty of advantages that you will find come in handy.

What is the airflow rate on the Coway Airmega 300 air purifier?

The amount of air that a purifier can clean at a particular time, is an important feature to look for. The Coway air mega 300, cleans 335 cubic feet per minute.

This means that in one hour, it will clean a room that is 1256 square feet, twice! This is good airflow and will do a good job for places that usually have pollutants such as smoke. 

What room size does it cover?

Room size is important when it comes to choosing the right room purifier. If the air purifier is too small for the room that you place it in, you will not get the maximum effect. 

large room with stairway

It will be overwhelmed by the amount of air in the room and you may not feel the difference that it is making because it is in a large room. Imagine using a swab to wipe up a few droplets of water. 

It will be effective right? But now try to imagine using the same swab to wipe away 25 liters of water spilled on the same surface. The process will be tedious and almost impossible. The Coway air mega 300, covers a room of 1,256 square feet.

What are the key features of this air purifier?

The Coway air mega 300, has several very handy features. For example, it has a smart mode. In this day and age, this is a big advantage. The modes include auto, eco, and sleep mode. 

It has a dedicated pre-filter and a HEPA filter indicator as well. The pre-filter on the Coway is washable. This allows you to re-use it. It is easy on the pocket, but for some, it is more work than it’s worth.

 It has a 4 stage filtration process and a MAX2 filter which is a true HEPA filter and an activated carbon filter. It has a customizable pollution sensor. Setting it at one bar means that you have chosen the sensitive option. 

The two-bar setting is for normal whilst the three-bar setting is for less sensitive. It also tells you the quality of air that the room has, in real-time. The LED ring light is visually appealing and will let you know when you need to pay attention to the unit. 

It will tell you when the air is good, moderate, unhealthy or very unhealthy. It also has a dedicated pre-filter and HEPA filter indicator. You also get 3 fan speeds as well as a built-in timer.


The Coway air mega 300, is a cutting edge new purifier, that is a great buy. You can clean the air in large rooms. There is not much difference in price between this model and the next model. 

This is one of the things that you may want to think about before buying it. Get the features that you need in a purifier and make sure that they do not cost you an arm and a leg. 

The unit needs to be sustainable and we think this is a good buy, as long as you know all the features that it comes with and what you will need to do to maintain it. Happy shopping!

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