Coway 300 vs 400 vs 400s, Which Is Best

Air purifiers have been a popular way to keep the air in your home clean from allergens, bacteria, and viruses. With so many options on the market it can be difficult to know which one is right for your needs. 

We’re going to take a look at three top rated models: Coway 300 vs 400 vs 400s. After reading this comparison you will easily choose the right one according to your needs.

Key Difference Between Coway 300 vs 400 vs 400s

The key difference of Coway 300 vs Coway 400 vs Coway 400s is that the latter two models have an extra filter stage which results in a higher MERV rating. This means that the Coway 400 and Coway 400s are better at trapping smaller particles, such as allergens and smoke, than the Coway 300.

The MERV rating is also important because it indicates how much noise the air purifier will make when in use. The Coway 400s has the highest MERV rating of all three models, meaning that it will make less noise than the other two when it’s running. 

         Coway 300                   Coway 400                     Coway 400S

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Fan Speed & Coverage Area

The Airmega 300 and 400 are low-energy consumers, drawing only 57 watts. Both air purifier devices can cover up to 1,256 square feet in one hour and circulate the air twice. The air charge rate climbs to four times per hour in rooms up to 628 square feet.

AIRMEGA 400s have a 2X to 4X ACH. This ACH is comparable to Rabbit Air MinusA2 in terms of high-range air purification, but not as good as Honeywell HPA600B.

The handbook does not provide the CADR of the AIRMEGA 400S. However, after several testing, I was able to obtain a valid CADR of 340 Dust/ 350 Smoke/ 400 Pollen (cfm). Such a CADR rating is insufficient for a big room air purifier like the AIRMEGA 400S, which covers 1560 square feet. 

However, it is still outstanding, and in the same price range, it is rare to find an air purifier with the same fan power as the AIRMEGA 400S.

A three-speed fan is included on all three Airmega air purifiers, which may be controlled manually. Whether set at 52 decibels high or 22 decibels low, these air purifiers provide silent functioning, collecting dirty air from both sides of the machine and discharging clean air from the top.

Filtration System Differences Between Coway 300 vs 400 vs 400s

All three models come with a variety of filters that can be replaced on your needs. The activated carbon filter is included with all three models, but each model comes with a few extra filters. 

The Coway 400s has an additional odor filter, which is good at trapping unpleasant smells. The Coway 300 doesn’t come with the odor filter, but instead has a pre-filter to protect your air purifier from dust and other small particles.

The Coway 400 comes with two filters that can be replaced by users: an activated carbon filter for general purposes and a pre-filter to trap dust before it enters the unit’s base. 

These are unique additions that can serve well for those who want to change their air purifier based on the changes in seasons or work environments. For example, during allergy season you may want to replace your activated carbon filter with an allergy filter to prevent dust and other allergens from entering your air purifier.

The Coway 400s has two filters that can be replaced by users: an activated carbon filter for general purposes and an odor filter for trapping unpleasant smells. The additional odor filter is good at trapping smoke, pet odors, ammonia, sulfur, and various chemicals.

All three models are equipped with a germicidal lamp to defeat airborne germs. However, the Coway 400s has an additional ultraviolet light which helps kill mold spores & germs on metal surfaces within range of the unit’s UV rays.

To use the ultraviolet feature effectively it should be used in conjunction with another form of filtration (e.g., activated carbon filter, allergy filter).

WIFI & Control

The manual controls and LED indicators on the top panel of each Coway Airmega air purifier are situated on the top panel of each unit. Coway employed concave buttons to make them easier to find in low light. 

You may adjust the fan speed, switch off the air-quality indicator, and set a timer from the control panel. You’ll hear a lovely chiming sound when you turn on any of the air purifiers. If you’re not interested in smart appliances, the 300 or 400 models will suffice.

These air purifiers have a lot to offer despite the lack of Wi-Fi access. The settings are well labeled and logically illustrated, and the fan speed and an 8-hour timer can be automated.

Use the coway 400S with your iPhone or Android. It’s simple to set up these two Wi-Fi-enabled models: simply download the Coway IoCare app, couple your phone with the purifier, and go to the home screen.

You can use the mobile app to create an operation schedule, receive indoor and outdoor air quality readings, and change the sensitivity of smart mode. In addition, Alexa and the Amazon Dash Button are both compatible with the 300S and 400S for voice control and filter orders, respectively.

Size & Sleep Mode

You don’t have to toss and turn to get clean air if light or noise bothers you while you sleep. If the Airmega air purifiers are set to the smart option, they will fall into sleep mode. Sleep mode kicks in after 3 minutes of darkness and good air quality, turning off the indicator light and lowering the fan speed.

The Airmega 300 and 300S have a distinct mid-century modern flair with their clean white housing on four tapering peg legs. When assembled, the air purifiers are 13.6 by 13.6 inches in width and depth and 20.1 inches in height. When carrying the 21.4-pound purifiers, two recessed handles provide a sturdy grip.

Coway elected to maintain the 400 and 400S in the same clean, modern style as the 300 and 300S, and we can’t say we blame them! The 400 models are significantly heavier than the 300s, weighing 24.7 pounds, but they are still manageable to maneuver, especially when held by the side handles. They’re also bigger, with a width and depth of 1.2 inches and a height of 2.7 inches.

Coway 300 Review

The Coway Airmega 300 air purifier has a premium appearance on the market. It has a square form and draws air in from both sides. In addition, the air inlet grills are magnetically secured, making filter replacement a breeze.

It has an auto fan adjust mode that adjusts to the quality of the air in the room, as well as a sleep mode and an environmental model. A real HEPA filter is using as the primary filter to catch particle contaminants. It also contains an odor-filtering layer made of activated carbon.

Filtration System

The Coway Airmega 300 has a three-stage physical air filter system. A permanent and washable net-type filter is used in the first stage. Larger pollutants (PM10), such as pet fur, hair, lines, and dust, are blocked by this filter. It also guards against clogging of the primary filter.

The air purifier contains a combination HEPA and activated carbon filter, which they name the Max2 filter, after the permanent prefilter. The HEPA filter can capture 99.97 percent of minuscule particles as small as 0.3 microns, such as dust, mold spores, smoke droplets, and other contaminants.

The honeycomb-shaped carbon pellets can absorb household scents and VOCs packed odor and gas filter. It can purge 96 percent of various VOCs and gases, according to Coway. There are no ionizer, UV-C light, or other electronic air filters available as options. As a result, it becomes an ozone-free air purifier that is completely safe for everyone.

A filter replacement indicator is also included in the Coway Airmega 300. In addition, the Max2 filter has a lifespan of nearly a year.

Coverage Of Coway Air Mega 300

The Coway Airmega 300 has a Clean Air Delivery Rate (CADR) of 335 cfm, which is good. This powerful CADR can clean a large 1256 square foot room twice per hour or a 500 square foot room five times per hour.

In addition, the air purifier’s airflow rate makes it ideal for removing smoking or heavy contaminants where faster air cleaning is required.

The air purifier includes a dual air inlet system, so it can handle a lot of air. The CADR rating, on the other hand, is assessed independently and is not certified by AHAM.

Coway Air Mega 300 Sensors

The Coway Airmega 300 has an air quality sensor integrated with that measures particle levels (PM 2.5) in the air. It also has a lighted LED indicator that shows the current air quality. Blue, Green Amber, and Red lights classify the air as Good, Moderate, Unhealthy, and Very Unhealthy.

Coway Air Mega 300 Control

Smart mode is available on the Coway Airmega 300. The purifier detects contaminants in the air and automatically changes the fan speed in this mode. It also has three manual fan speed settings: low, medium, and high.

You can choose from three options in the smart mode: Auto, Eco, and Sleep. It also has three timer modes: one, four, and eight hours.

Coway Air Mega 300 Noise Level

This air purifier makes a surprisingly minimal amount of noise. It’s only 22dB at its quietest setting, barely audible. The noise level is relatively modest, at 52dB at the greatest fan speed. As a result, it can assist you with overnight operation on the highest settings, especially on Smokey days when air purifiers must run at maximum speed. This purifier shines the brightest in the sleep mode.

Specifications of Coway 300

  • Product: Coway Airmega 300
  • Dimension: 13.6 x 21.2 x 13.6 in (34.5 x 53.8 x 34.5 cm)
  • Weight: 21.4 lb. (9.7 kg)
  • Fan speed: 3
  • Coverage (up to): 1,256 sq. ft. (117 m2)
  • Airflow speed
  • Dust free (CADR): 260 cfm (442 m3/h)
  • Pollen free (CADR): 260 cfm (442 m3/h)
  • Smoke free (CADR): 260 cfm (442 m3/h)
  • Humidifying speed
  • Filtration: 4-stage
  • Pre-Filter (- Lifespan- Replacement cost ($)): Pre-filter (2 pack) Permanent +- 25
  • HEPA filter (- Lifespan- Replacement cost ($)): Max2 (Green True HEPA filter) 1 year
  • Carbon filter (- Lifespan- Replacement cost ($)): Max2 (Activated carbon filter) 1 year
  • Ionizer/ Technologies
  • UV-light/ PCO
  • Other filters
  • All-in-one filter (- Lifespan- Replacement cost ($)): Max2 Filter 1 year +- 99.99
  • Optional/ Addon
  • Noise level: 22 – 52 dB
  • Power usage level: 6 -57 W
  • Timer/ Scheduler: 1, 4, 8 hours
  • Sensors Pollution sensor
  • Auto mode
  • Air quality indicator
  • Filter change indicator
  • More color options
  • Wi-Fi/ Bluetooth

Coway AirMega 300 Pros & Cons

Pros
  • Premium in appearance and feel.
  • A honeycomb carbon filter with true HEPA.
  • Dual air inlets, high air supply rate
  • Prefilter that is both permanent and washable.
  • Particle sensor built-in, real-time air quality indication
  • Filter replacement indicator, sleep mode
  • Annual operating costs that are reasonable.
  • CARB approved and completely ozone-free.
Cons
  • CADR has not been certified by AHAM.
  • There is no kid lock on this white variant.
  • Strong scents should not be removed with this product.
  • It costs a little more.

Coway 400 Review

Because of its 1560 square feet of coverage, the Coway Airmega 400 is the choice for larger-than-life settings. It’s also extremely energy-efficient, automatically altering fan speeds to ensure that no more energy is consuming than is requiring.

The fact that the Airmega 400 is Energy Star certified and has a Smart mode appeals to me. When the fan is set to Smart mode, it will turn off after 10 minutes of low pollution levels. It automatically starts up if it detects contaminants in the air until the levels reflect good air quality again. This allows you to save money on your utility costs.

Features of Coway 400

Design of Coway Air Mega 400

The design of the Coway AIRMEGA 400 is greatly improved. The AIRMEGA 400 design’s most crucial feature is that it cleans the air from both sides. As a result, the AIRMEGA 400 air purifier will fit into the smallest of spaces. This is about the same size as a small table. In addition, this air purifier weighs 24.7 pounds.

Although it is not particularly heavy, it lacks wheels and just has small handholds on the side panels for transporting. As a result, this air purifier may simply be used in large rooms.

Speed & Power Of Coway Air Mega 400

In terms of power consumption, the Coway Airmega 300 consumes 64 watts. To put it in context, certain light bulbs actually consume more energy. Despite this, the Airmega 300 achieves the same results with the same or less power. There are four speeds to choose from, but Smart Mode allows them to adapt themselves.

Coverage Of Coway Air Mega 400

With so much power, you can expect a lot of coverage. However, it works best in the space of no more than 1560 square feet. Any more than that, and its 400 CFM rating will begin to deteriorate. The Alen Breathe Smart Classic Large Room Air Purifier, on the other hand, only covers 1100 square feet but costs $100 more.

Filtration System of Coway Airmega 400

The Coway Airmega 400 employs two—well, more like 2.5—stages of filtration, where as some purifiers use three. This may appear to be less efficient, but it really combines rather than separates filters. Particles hit prefilters first; then the Coway Airmega combination activated carbon green True HEPA filter. Normally, carbon and HEPA filters are kept separate, but they are integrated with the Max2 Filter set. Both prefilter Max2 filters are washable. Particles as fine as 0.3 microns will be collected in the majority of cases. If this had been the Modify Air, it would have gone through a 4-stage filtering system instead of 2.5.

Pre-filters that can be washed — one on each side of the unit. You can vacuum it gently or wash it under running water. Before reinstalling, allow to air dry entirely.

Under the prefilters, there are two Max2 filters, one on each side. In addition, activated carbon and True HEPA layers are combined.

The Airmega 400 does not have an ionizing feature, so those who are sensitive to the ozone should be fine with it. The Max2 filters will last around one year, but the prefilters will last several years if well maintained and not torn.

CADR & ACH Ratings Coway Airmega 400

You may expect a 2X ACH (air changes per hour) at its maximum capacity (1,560 sq. feet), which means it cleans all the air in that size of space twice in one hour. However, it operates twice as well in a room half the size and has a 4X ACH rating, as you might expect (780 sq. feet). Again, this is because it cleans the air twice an hour at its highest capacity.

Independent testing indicates the CADR (clean air delivery rate) for pollen, dust, and smoke at 350 with a maximum CFM (cubic feet per minute) of 410, despite the fact that Coway does not specify it in the handbook.

Durability Coway Airmega 400

With just one look at the Coway Airmega 400, you can tell it’s built to last. It has four legs projecting from the bottom and is entirely made of thick plastic, making it both lighter and sturdier. If someone occurs to pump into it, these will give it more solidity.

Noise Level Coway Airmega 400

The Airmega 400 is whisper quiet at its lowest fan setting, around 22 dB, and only reaches a maximum of 52 dB at its highest fan setting. As far as air purifiers go, that’s nice and quiet. It’s quiet enough to make phone calls or hold a discussion comfortably.

Performance Coway Airmega 400

The AIRMEGA 400 air purifier assists people with allergies such as asthma and other sensitive allergies and reduces their risks of getting sick.

AIRMEGA 400 air purifies the indoor air by removing dust, cigarette smoke, pet dander, and 0.3-micron particles. Also useful for cooking scents.

This is a great option if you’re looking for an air purifier for large rooms or offices. Keep in mind that the 400 covers 1,560 square feet. This air purifier can easily manage the highest amount of area. In a room half that size, it’s much more effective.

Specification of Coway 400

  • Product: Coway Airmega 400
  • Dimension: 14.8 x 22.8 x 14.8 in
  • (37.6 x 57.9 x 37.6 cm)
  • Weight: 24.7 lb. (11.2 kg)
  • Fan speed: 3
  • Coverage (up to): 1,560 sq. ft. (145 m2)
  • Dust free (CADR): 350 cfm (595 m3/h)
  • Pollen free (CADR): 350 cfm (595 m3/h)
  • Smoke free (CADR): 350 cfm (595 m3/h)
  • Humidifying speed
  • Filtration: 4-stage
  • Pre-Filter
  • – Lifespan
  • – Replacement cost ($)
  • Pre-filter (2 pack)
  • Permanent
  • +- 25
  • HEPA filter
  • – Lifespan
  • – Replacement cost ($)
  • Max2 (Green True HEPA filter)
  • 1 year
  • Carbon filter
  • – Lifespan
  • – Replacement cost ($)
  • Max2 (Activated carbon filter)
  • 1 year
  • Ionizer/ Technologies
  • UV-light/ PCO
  • Other filters
  • All-in-one filter
  • – Lifespan
  • – Replacement cost ($)
  • Max2 Filter
  • 1 year
  • +- 129.99
  • Optional/ Addon
  • Noise level: 22 – 52 dB
  • Power usage level: 6 – 66 W
  • Timer/ Scheduler: 1, 4, 8 hours
  • Sensors: Pollution sensor, Light sensor
  • Auto mode
  • Air quality indicator
  • Filter change indicator
  • More color options
  • Wi-Fi/ Bluetooth

Coway AirMega 400 Pros & Cons

Pros
  • Filtration system with four stages.
  • Mold, dust, pet dander, and pollen are the worst offenders.
  • Best for allergies.
  • Indoor air quality sensor
  • Filter lifespan indicator
  • Timer
Cons
  • UV not Available

Coway 400s Review

The Airmega 400S is the result of the company’s extensive research and development over many years. The WIFI-connect device was created with large indoor spaces in mind. It’s Alexa-compatible and comes with a slew of smart features and sensors, including an air quality monitor onboard. So if you lead a busy life, an air cleaner that you can manage from a distance may appeal to you. The Airmega 400S also comes with a superb filter combination that can trap even the tiniest pollutants, a fine control panel, and four fans.

Although it is more expensive than other models on the market, its features and area can cover more than makeup for it.

Filtration system  

true HEPA filter activated carbon filter, and washable prefilters are included in the package.

Prefilters: These tiny mesh filters are the first point of contact for particles. It’s made to get rid of dust, dander, fur, and hair that’s drifting throughout your house. The major goal of these washable filters is to extend the life of HEPA filters by preventing bigger pollutants from clogging them. To extend the life of your unit and maintain efficiency in its operation, clean it twice or at least once a month.

TrueHEPA Filter Set by Max2: An activated carbon filter and a Green TrueHEPA filter are included in the set. The Green filter can capture up to 99.97 percent of fumes and all particles in your space’s air, keeping it free of contaminants like dust, mold, and pollen. On the other hand, the activated carbon filter can absorb cooking scents and other unwanted aromas.

If you use these filters for roughly 8 hours each day, you should replace them once a year. The replacement cost may be higher than the majority of air cleaners on the market, but the device does come with a set of two filters and can service a large area that would require two standard air purifiers.

 

The Airmega 400S contains quality indications, so there’s no need to replace or clean it on a regular basis. Instead, when it’s time to bother about its filters, it’ll let you know.

Noise Level Airmega 400S

You will not be disappointed because this device does not produce as much noise as you anticipated. When it’s turned down to its lowest setting, the noise level is 22 decibels (dB). However, using it on the highest settings results in a noise level of 52 decibels (dB).

Coway, the manufacturer of the Coway AIRMEGA 400S, is constantly updating its product line. As a result, the Coway AIRMEGA 400S’s greater fan power doesn’t translate to much noise. When utilized at the lowest settings, the quoted noise level is comparable to that of a whisper. It is also comfortable for a bedroom when used in the highest settings. To that sense, it’s not unreasonable to speculate that the Coway AIRMEGA 400S has an Ultra Quiet sound similar to the Rabbit Air MinusA2.

Size & Design Airmega 400S

With any form of design, Coway has never sat on his laurels for too long. And everything has altered dramatically since the AIRMEGA 300S. With a larger shape, the AIRMEGA 400S closely matches this design style. The AIRMEGA 400S, on the other hand, truly stands out. This is because the dimensions are officially larger, with a height of 22.8 inches and depth and width of 14.8 inches, compared to 21.2 inches for the AIRMEGA 300S.

If you want the ordinary version, the AIRMEGA 400, you can acquire it for the price listed below. Only the Wi-Fi connectivity function distinguishes the two variants, which have the same design and power. It is entirely up to you to make your choice.

Performance Airmega 400S

In terms of performance, the Coway AIRMEGA 400S outperforms the competition. The Coway AIRMEGA has a 99.95 percent performance rate and purifies air every two hours. This allows the user to have ongoing access to fresh air.

Because of its greater filter and area coverage, the Coway Airmega 400S outperforms competing for HEPA and HEPA-type air purifiers. Furthermore, when compared to competitors such as Levoit, Honeywell, and BlueAir, the Air purifier would perform even better in a small space.

Coverage Area of Airmega 400S

Before attempting to purchase Coway AIRMEGA 400S, it is critical to understand the room coverage. Room coverage is a concept that is entirely dependent on the size of the room or residence in question. As a result, the coverage should be simple to obtain while you operate, and the user should not encounter any obstacles. In addition, the Coway AIRMEGA 400S has a purification range of approximately 1,560 square feet. This coverage is adequate to purify the air and eliminate pollutants and dangerous air particles throughout the house.

Durability Of Airmega 400S

The Coway AIRMEGA 400S’s strength and durability should be examined. Is the device long-lasting? The Coway AIRMEGA 400S is clearly built to last, as evidenced by its outer appearance. The item is also constructed from the best and most durable materials available. As a result, you’re confident that it’ll last a long time.

CADR & ACH Ratings Of Airmega 400S

AIRMEGA 400s have a 2X to 4X ACH. This ACH is comparable to Rabbit Air MinusA2 in terms of high-range air purification but not as good as Honeywell HPA600B.

The handbook does not specify the CADR of the AIRMEGA 400S. However, after numerous tests, I was able to obtain a reliable CADR of 340 Dust/ 350 Smoke/ 400 Pollen (cfm). Such a CADR rating is insufficient for a large room air purifier like the AIRMEGA 400S, which covers 1560 square feet. However, it is still outstanding, and in the same price range, it is difficult to find an air purifier with the same fan power as the AIRMEGA 400S.

Power Consumption Of Airmega 400S

The power consumption of the AIRMEGA 400S is quite low at 64 watts. I never imagined an air purifier for a huge room could consume less energy than a light bulb, did I? For the same performance rating, the AIRMEGA 400S uses half as much power as the Honeywell HPA300. Also, thanks to the dependable Eco Mode, I expect this air purifier to use far less electricity.

The Blueair Classic 605 performs better for a brief comparison, although it has a maximum power usage of 100 watts. The Honeywell HPA600B, which has less space coverage but a lower power consumption of 44 watts, is another option. AIRMEGA 400S is expected to be in the middle once more.

The AIRMEGA 400S is also an energy-efficient air purifier with an Energy Star rating. Again, this is a government-backed symbol that ensures you obtain the best air purifier.

Specification of Coway 400s

  • Product: Coway Airmega 400S
  • Dimension: 14.8 x 22.8 x 14.8 in
  • (37.6 x 57.9 x 37.6 cm)
  • Weight: 24.7 lb. (11.2 kg)
  • Fan speed: 3
  • Coverage (up to): 1,560 sq. ft. (145 m2)
  • Airflow speed
  • Dust free (CADR): 350 cfm (595 m3/h)
  • Pollen free (CADR): 350 cfm (595 m3/h)
  • Smoke free (CADR): 350 cfm (595 m3/h)
  • Humidifying speed
  • Filtration: 4-stage
  • Pre-Filter (- Lifespan- Replacement cost ($))
  • Pre-filter (2 pack)
  • Permanent
  • +- 25
  • HEPA filter (- Lifespan- Replacement cost ($)): Max2 (Green True HEPA filter)1 year
  • Carbon filter (- Lifespan- Replacement cost ($)): Max2 (Activated carbon filter)1 year
  • Ionizer/ Technologies
  • UV-light/ PCO
  • Another filter
  • All-in-one filter (- Lifespan- Replacement cost ($)): Max2 Filter1 year +- 129.99
  • Optional/ Addon
  • Noise level: 22 – 52 dB
  • Power usage level: 6 – 66 W
  • Timer/ Scheduler: 1, 2, 4, 8 hours (App), Scheduler
  • Sensors Pollution sensor, Light sensor
  • Auto mode
  • Air quality indicator
  • Filter change indicator
  • More color options
  • Wi-Fi/ Bluetooth

Pros & Cons

Pros
  • Large Space coverage
  • It runs quietly.
  • Large particles can be trapped on both sides of the intake.
  • Excellent technological advancements.
  • It is extremely effective against smoke and pollutants as small as 0.3 microns.
  • Smart app features and smart modes are available.
  • Alexa and cellphones are both supported.
Cons
  • It’s more expensive than other air purifiers.
  • Its app has received a lot of bad feedback.
  • Even if you just need to replace your filter once a year, it is costly.
  • It is not possible to access the system remotely.
  • There is no choice for an ionizer.

Conclusion:

Get all of the features you’d expect from a top-of-the-line air purifier, plus a few extras, at a price that won’t break the bank. The air purifiers include three fan speeds, a pre-filter, and a carbon-lined HEPA filter. They also have a prefilter and a carbon-lined HEPA filter. Airmega air purifiers with Wi-Fi are also available if you want to add to your smart home appliance collection. The coway 400s vs. the coway 300 vs. coway 400 are three different Air Purifiers.

Here’s a basic breakdown if you have trouble picking which Airmega air purifier to buy. The Airmega 300 is ideal for big, enclosed spaces, while the Airmega 400 is ideal for open-plan living. The Airmega 400S for extra-large rooms is a Wi-Fi-enabled air purifier.

You’ll get a fashionable, efficient, and well-designed air purifier regardless of the Airmega model you choose.

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