Home › Large (250–399 CADR) › Coway Airmega 300
Coway Airmega 300
#6 of 18 in large · #12 of 49 overall · all Coway models
3.5
Two-sided filtration with a real carbon layer; filters cost more than most.
300 cfmsmoke CADR
465 sq ftAHAM room size
52 dBat full speed
57 Wmax power
$279street price, being verified
One air change of a 300 sq ft room in about 8 min$110 a year in filters$829 to own for 5 yearsAHAM Verifide CADR1.1 lb activated carbon
Ratings
Includes independent measurements from HouseFresh.
Each rating places this unit among the others on a 0.5–5 scale, within its room-size class for the measures that scale with size and across the whole catalog for the rest. Weighted together they give the overall 3.5. Formula and weights.
Specifications
- Smoke CADR
- 300 cfm
- Dust CADR
- 300 cfm
- Pollen CADR
- 300 cfm
- AHAM room size
- 465 sq ft
- Maker's room size
- 1,256 sq ft
- Max power
- 57 W
- Noise (low / high)
- 22 / 52 dB
- Filter cost
- $110
- Filter life
- 12 months
- Filters per year
- $110
- 5-year cost of ownership
- $829
- True HEPA
- Yes
- Activated carbon
- 1.1 lb
- Auto mode (PM2.5 sensor)
- Yes
- App
- No
- Washable prefilter
- Yes
- AHAM Verifide
- Yes
- Energy Star
- Yes
- Weight
- 21.4 lb
- Released
- 2017
Independent measurements
| Metric | Value | Source |
|---|---|---|
| Time to clear test room 705 cu ft office test room (older HouseFresh format); incense smoke cleared (100%); top speed. Page mixes 300 and 300S imagery; treated as the 300 | 26 min | HouseFresh 2025-12 |
| Power draw, measured highest fan speed; older-format review with only a top-speed figure; differs from Coway's 57 W spec so taken as measured | 52.5 W | HouseFresh 2025-12 |
How it compares with its neighbors
| # | Model | Smoke CADR | Dust | Pollen | W | dB max | Filters/yr | $/CADR | Score |
|---|---|---|---|---|---|---|---|---|---|
| 3 | Blueair Blue Pure 311i Max | 250 | 321 | 250 | 36 | 50 | $120 | 0.7 | 3.6 |
| 4 | Blueair Blue Pure 311 Auto | 250 | 250 | 250 | 30 | 50 | $120 | 0.8 | 3.6 |
| 5 | Levoit EverestAir | 360 | 340 | 350 | 49 | 52 | $160 | 1.1 | 3.5 |
| 6 | Coway Airmega 300 | 300 | 300 | 300 | 57 | 52 | $110 | 0.9 | 3.5 |
| 7 | Coway Airmega 400 | 350 | 350 | 350 | 66 | 52 | $130 | 1.1 | 3.4 |
| 8 | Alen BreatheSmart 75i | 347 | 350 | 350 | 60 | 49 | $99 | 1.7 | 3.3 |
| 9 | Coway Airmega 400S | 350 | 350 | 350 | 66 | 52 | $130 | 1.3 | 3.3 |