Coway Airmega 300 Review In 2022: Is This Air Purifier Any Good?

This is the "lowest" range model in its stable: Coway Airmega 300 air purifier. Let's be clear, it is not cheap despite being the lowest range in its series. In return, 300 combines modern design and outstanding airflow delivery output. The ideal choice for the majority of city folks that stays in a more polluted environment. Can the lower selling price still offer the competitiveness edge in its own group? Read about the air purifier review or compare it with other Airmega models.
online price**
±649.00 $$$$$$/ 7

(annual filter cost ±100)

** MRSP (Manufacturer's Suggested Retail Price)/ RSP (Retail selling price) is accurate at the time of posting.
^ Annual filter cost is calculated based on filter price and 12 hours of usage. Pricing could vary depending on air quality, usage frequency, and speed.

Coway Airmega 300 Specification

ProductCoway Airmega 300
13.6 x 21.2 x 13.6 in
(34.5 x 53.8 x 34.5 cm)
Weight21.4 lb (9.7 kg)
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(H) speed
- Lifespan
- Replacement cost ($)
Pre-filter (2 pack)
+- 25
HEPA filter
- Lifespan
- Replacement cost ($)
Max2 (Green True HEPA filter)
1 year
Carbon filter
- Lifespan
- Replacement cost ($)
Max2 (Activated carbon filter)
1 year
Ionizer/ Technologies
UV-light/ PCO
Other filter
All-in-one filter
- Lifespan
- Replacement cost ($)
Max2 Filter
1 year
+- 99.99
Optional/ Addon
Noise level22 - 52 dB
Power usage level6 -57 W
Timer/ Scheduler1, 4, 8 hours
SensorsPollution sensor
Auto mode
Air qualityAQ indicator
Filter change indicator
More color options
Wi-Fi/ BTBluetooth
Remote control
Child lock
Warranty5 years
Email/ Phone support

Key Features

  • 4-stage filtration
  • Dual washable Pre-filter
  • MAX2 filter (True HEPA filter + Activated Carbon filter)
  • 3 fanspeed (Low, Medium, High)
  • Dual side air inlet
  • Dedicated Pre-filter and HEPA filter indicator
  • Smart mode - Auto, ECO and Sleep mode
  • Air quality display indicator (Good, Moderate, Unhealthy, Very Unhealthy)
  • Customizable pollution sensor (1 bar = sensitive, 2 bar = normal, 3 bar = less sensitive)
  • Built-in timer (1, 4, 8 hours)
  • 5 years warranty

Design And Usability

Coway Airmega 300 dimension
13.6 x 21.2 x 13.6 in
(34.5 x 53.8 x 34.5 cm)
Coway Airmega 300 weight
21.4 lb (9.7 kg)

Skip this section if you have gone through 300S review. A modern piece of artwork, Airmega 300 shares the exact dimension as other Airmega models. At 13.6 x 21.2 x 13.6 in and 21.4 lb weight including the legs, it is considerably bulky. You have the dual integrated sides air inlet, two side handles, and top black control panel. At front, there is a circle air quality indicator that will display in four different colors. By default, the ring indicator is in blue when indoor air quality is good. The color will shift to purple when air quality drop to moderate, Pink when is unhealthy, and Red when is very unhealthy. On the whole, build quality and fitting are right on top with no signs of ozone or off-gassing. No problem getting this air purifier for the long-haul.

Coway Airmega 300 control

Most air purifier that has a centrally aligned control panel. Coway Airmega 300 controls are segregated to 2 sections. On the left part, you will find a Timer button, Light button, Pre Wash button, and Max2 change button. Timer button comes with 1, 4, 8 hours pre-set setting that will cycle between them on click. “Lightbulb” Light button will either enable/ disable the front air quality indicator light. The bottom two buttons (Pre Wash/ Max2) will only lit when the filters require change (Max 2) or clean (Pre Wash). To reset either of the filter indicator light, press and hold the buttons for 2-3 seconds. There is also a small light sensor that measures the surrounding light intensity. It will automatically switch to Sleep mode when there is no light source in a room for more than 3 minutes. You can deactivate the Sleep mode by setting it to manual mode (non-Smart mode). As for the right part of the controls, you will find two main buttons that manage the entire operation. The prominent one is the power button which turns on or off (hold for 2-3 seconds) the air purifier. The less prominent button control the fan speed or cycle between Sleep or Smart mode.

One neat trick that most people didn’t know, the pollution sensor’s sensitivity can be tuned. To start, press and hold the Light + Air speed/ mode button. Once active, press the Air speed/ mode button repeatedly until you selected the preferred sensitivity. 1 fan bar = Sensitive, 2 fan bar = Normal, 3 fan bar = Less sensitive.

To recap, standard features in 300 include a 4 stage filtration, 3 fan speed, and “Smart” Auto, Sleep, Eco mode. AQ indicator, built-in timer (1, 4, 8), and separate pre-filter/ HEPA filter indicator that based on run time. End with 30 days money back guarantee and 5 years warranty.

Airflow, Coverage, And CADR

Coway Airmega 300 coverage
Purifying coverage
1,256 sq. ft. (117 m2)
Coway Airmega 300 fanspeed
Coway Airmega 300 is the lower end in the group; its 1,256 sq. ft. purifying coverage performance is anything but that. By default, the 2 air changes per hour purifying is great for everyday use. An asthmatic or hyper-sensitive allergenic person can up it to 4 that reduce coverage to half (628 sq. ft.) for faster purifying. The punchy airflow distribution is sufficient even for large room size e.g. living hall. In Sleep mode, the air purifier chooses the lowest possible speed to reduce noise and power. In Smart mode, the air purifier will adjust the fan speed according to nearby pollutants.
Coway Airmega 300 dust CADR
260 cfm (442 m3/h)
Coway Airmega 300 pollen CADR
Pollen CADR
260 cfm (442 m3/h)
Coway Airmega 300 smoke CADR
Smoke CADR
260 cfm (442 m3/h)
Following the purifying trend, CADR stands high at 260 cfm for dust, pollen, and smoke. Better than most air purifiers CADR in the market but fall short to 400/ 400S at around 100 cfm. You can safely count on Airmega 300 in trapping household allergens and smoke.

Recommended Read

Filters And Performance

Equipped with the same filter quality from its series, Airmega 300 4-stage filtration is very dependable. As air flows in from left and right, the dual pre-filter would cover both sides of the air intake. Dust, hair, and other large particles would be trapped while on the way in. With smaller particles sneaked pass the pre-filter, the "genuine" Green True HEPA filter is ready and waiting. Any allergens or microorganisms as small as 0.01 microns will be halt from proceeding with an efficiency of 99.999%. For chemical smoke and gases, you have the reliable Activated Carbon filter standing by. All that missing from the filtration list is an optional ionizer. Despite its commonality, most people can live without it.

Noise And Energy Usage

Coway Airmega 300 noise level
Noise level
22 - 52 dB
Coway Airmega 300 power consumption
Power consumption
6 -57 W
As we touched on the airflow performance above, the 22 - 52 dB noise level is less intrusive with what it would output. In normal circumstances, you can barely tell the differences compared with other models. At lowest speed, it is perfectly fine for night time use or set it to Auto/ Sleep mode for autonomous operation. 6 -57 W power consumption is up there as industry standard thus this is not the most economical air cleaner in town. If you plan to use it 24x7, always leave it in cost-saving Smart mode (Auto/ Sleep/ Eco). The air purifier would determine what should be the optimal fan speed.

Pricing And Maintainence Cost

Coway Airmega 300 MRSP/ RSP
+- 649.00
Coway Airmega 300 annual filter replacement cost
Annual Filter Cost
+- 100
^ Replacement filters/ estimated cost
Coway Airmega 300 is the most "affordable" air purifier in its lineup but not so in the larger room size group. The premium price tag will get you a well-equipped air purifier specification. White is the only color variant unless you opt for the higher 400 series. As for maintenance cost, we are happy with the bundled Max2 filter set price VS longevity. On normal use, both Green True HEPA + Activated Carbon filter only require annual change.
Let's start with the good stuff: You can get Coway Airmega 300 at a much lower price in Amazon. Plus the usual Amazon perks like 30 days return policy, prime, and free shipping. Purchasing from official website is also doable. You will enjoy special price, 30-day money-back guarantee, easy payment, and free shipping. Some online retailers like Best Buy, Bed, Bath and Beyond, Kohls, Walmart also carry the brand. Just keep exception low as the pricing would not be as competitive as the above options.

Coway Airmega 300 VS The Challengers

Coway Airmega 300 Review

Coway Airmega 300S

Adds remote control feature and Coway app support features. 300S is the more expensive option to go for if you want the essence of Airmega with added Wi-Fi connectivity.
Coway Airmega 400 Review

Coway Airmega 400

Identical model but upped in airflow performance and coverage. There is also a real-time pre-filter/ HEPA filter usage calculator. You do have to trade-off with a bigger dimension and a much higher cost.
Coway Airmega AP-1512HH Mighty Air Purifier Review

Coway Airmega AP-1512HH Mighty

Coway Mighty air purifier is definitely not at the same level. You do get more than adequate airflow circulation for large room size. Also cost way less to own and maintain with a proven HEPA + Carbon filtration set.
Rabbit Air MinusA2 Air Purifier Review

Rabbit Air MinusA2 SPA-780A

If 6-stage filtration is your cup of tea, then Rabbit Air MinusA2 SPA-780A is your best possible choice. It has the advantages of a wall-frameable body and interchangeable front panel. Purifying coverage and airflow delivery rate is slightly under par though.

Final Thoughts On Coway Airmega 300

Coway Airmega 300 is a fantastic air purifier that not many people can afford. Based on 160+ Amazon reviews, 85% of the 4-5 stars users like how clean their indoor air has become. Thumbs up also on the wide coverage, Green True HEPA filter, and activated carbon filter. Most users like Airmega elegant and modern design. They appreciate features like air quality indicator, air inlet, and nicely integrated buttons. Finally, a small number of users commented on the inexpensive MAX2 filter replacement. As for the dislike, only 12% of the 1-2 stars users think the air purifier is ineffective. Particularly against indoor smoke and odor. Some also didn't like the plastic adhesive smell coming out of the air purifier. All in all, the likes unquestionably outweigh the dislikes. If the cost can be forgo, Airmega 300 air purifier should be in your consideration list.


  • Very wide purifying coverage despite being the least expensive in its series.
  • Dual pre-filter that traps large particles coming from both sides. Also protect and extent the inner filter lifespan.
  • Excellent allergens and smoke filtration via its Green True HEPA/ Carbon filter.
  • Auto mode that is sensitive to surrounding air quality.
  • Separate Pre-filter and MAX2 filter lifetime indicator.
  • Built-in timer without having to rely on the app.
  • Clear and accurate real-time air quality display indicator.
  • Acceptable annual Max2 filter replacement cost for its higher-end category.
  • 5 years official warranty from Coway.


  • Still expensive despite being the cheapest model in the group.
  • After online discounted price, you only need to top up a little bit more for the Wi-Fi version (300S).
  • Lacks autonomous sleep mode and real-time filter replacement indicator found in 400/ 400S models.
  • No Ionizer as an additional filtration option.
Coway Airmega 300 Review

Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.
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