Coway Airmega 400 Smart Purifier
The Coway Airmega 400 Smart Purifier delivers verified AHAM CADR performance (500 Smoke / 500 Dust) for rooms up to 780 sq ft. Featuring multi-stage H13 True HEPA and active odor adsorption.
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3-Year True Cost of Ownership Model
Independent chamber CADR verified under AHAM AC-1 protocol.
Minimal airflow drop (~0.14 in. w.g.) protects blowers with limited static headroom.
Thermal beverage board frame with wire backing to prevent media collapse under blower load.
Bulk multi-pack procurement typically reduces annual per-filter cost by 25% to 40%.
- Certified 500 Smoke CADR rating
- Whisper-quiet sleep mode (22)
- Energy Star low power consumption
- Real-time air quality sensor
- Replacement filter required every 6 to 12 months
- Coverage capped at 780 sq ft
Verified Engineering Specifications
| Nominal Dimensions | Round / Custom Cartridge | Actual Dimensions | Integrated Machine Unit |
|---|---|---|---|
| Filter Depth | Standalone Unit | Media Construction | H13 True HEPA & Granular Carbon |
| ASHRAE MERV Rating | MERV 17 (True HEPA) | Proprietary Rating | |
| Initial Resistance | Integrated Variable Multi-Speed Blower | Airflow Capacity | 508 sq ft @ 4.8 ACH (1220 sq ft @ 2 ACH) |
| Smoke CADR | 328 CFM | Dust / Pollen CADR | 328 / 328 CFM |
| Acoustic Noise | 22 – 52 dB | Rated Room Coverage | 508 sq ft @ 4.8 ACH (1220 sq ft @ 2 ACH) |
| Replacement Filter Cost | $119.00 | Replacement Interval | Every 12 Months months |
| Annual Consumable Cost | 119.00 | Compatible Equipment | Coway 400 System |
Our Take on the Coway Airmega 400 Smart Purifier
An exceptionally reliable room air purifier with whisper-quiet operation (22 min noise) and proven particle removal.
Filtration Performance Note
Traps 99.97% of particles down to 0.3 microns, including pollen, pet dander, mold spores, and airborne smoke particles.
Installation, Airflow Direction & Maintenance Protocol
Place 12 inches away from walls for unobstructed 360-degree intake. Replace HEPA filter when indicator light illuminates.
Common Questions About the Coway Airmega 400 Smart Purifier
What size room can the Coway Airmega 400 Smart Purifier handle?
It is certified for rooms up to 780 sq ft, completing roughly 5 air changes per hour in spaces of that volume.
How noisy is this purifier on low speed?
On its lowest setting, sound levels drop to 22, which is quieter than a gentle whisper.
How much do replacement filters cost for the 400?
Official Max2 Filter Set (400) replacement filters typically cost between $30 and $45 per cycle.
Direct Compatible Alternatives
Levoit Core 600S Smart Air Purifier
When to choose: Comparable large-room air purifier alternative.
Levoit EverestAir Smart Air Purifier
When to choose: Alternative large-room air purifier with similar CADR profile.