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Coway · Air purifiers

Coway Airmega 400

Dual-suction large room air purifier with Max2 HEPA and activated carbon filtration covering 1,560 sq ft.

List price

$549

11 attributes tracked

Catalog as of September 1, 2026

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

CADR

350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen)

Coverage area

1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr)

What it does well

  • Massive CADR cleans up to 1,560 sq ft twice per hour
  • Dual-sided air intake with combined True HEPA and carbon filters
  • Smart Eco mode turns off fan when air remains clean for 30 minutes

Where it gives ground

  • Cube design has a large floor footprint
  • No mobile app connectivity on the non-S model

Compare it head to head

The fastest way to decide is against the product you are actually cross shopping. Showing 4 of 12 published matchups.

Air purifiers11 differing specs

Alen BreatheSmart 75i Large Room Air Purifier

$749

Coway Airmega 400

$549

Coway leads on 3 of 4 rankable specs and costs less.

See the breakdown
Air purifiers11 differing specs

Blueair Protect 7470i

$649

Coway Airmega 400

$549

Coway leads on 3 of 3 rankable specs and costs less.

See the breakdown
Air purifiers11 differing specs

Coway Airmega 400

$549

Blueair Blue Pure 211+ Auto

$339

Coway leads on 4 of 6 rankable specs, but Blueair saves $210.

See the breakdown
Air purifiers11 differing specs

Coway Airmega 400

$549

Blueair Blue Pure 311i Max

$229

Coway leads on 4 of 5 rankable specs, but Blueair saves $320.

See the breakdown

Full specifications

Performance

CADR
350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen)
Room size
Large living rooms, open floor plans, offices
Coverage area
1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr)

Filters

Filter types
Washable Pre-filter + Max2 Filter (True HEPA + Activated Carbon)
Filter life
12 months (Max2 filter) / Washable pre-filters

Usability & Smart

Noise levels
22 dB (Sleep mode) – 52 dB (Max speed)
Energy consumption
66 W max power consumption (Energy Star Certified)
Smart features
Smart Auto Mode + Eco Mode (no Wi-Fi app)
Air quality sensors
Real-time particle sensor with colorful LED ring indicator

Design & Ownership

Weight
24.7 lb (11.2 kg)
Warranty
5 years limited motor / 1 year electronic parts
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.Official Coway Airmega 400 spec sheet (opens in a new tab)

Other air purifiers we track

Blueair

Blueair Protect 7470i

$649

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Coway

Coway Airmega 250

$399

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Alen

Alen BreatheSmart 75i Large Room Air Purifier

$749

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Blueair

Blueair Blue Pure 211+ Auto

$339

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Dyson

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

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Levoit

Levoit Core 600S Smart True HEPA

$299

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Frequently asked

How much does Coway Airmega 400 cost?

Coway Airmega 400 lists at $549 (manufacturer list price snapshot as of 2026-09-01). Retail prices vary by merchant and this is not a live quote.

What are Coway Airmega 400’s key specs?

Key specifications for Coway Airmega 400 include cadr (350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen)) and coverage area (1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr)).

What does Coway Airmega 400 compare against?

Coway Airmega 400 is compared head to head against Alen BreatheSmart 75i Large Room Air Purifier vs Coway Airmega 400, Blueair Protect 7470i vs Coway Airmega 400, Coway Airmega 400 vs Blueair Blue Pure 211+ Auto, Coway Airmega 400 vs Blueair Blue Pure 311i Max, Coway Airmega 400 vs Coway Airmega 250, and Coway Airmega 400 vs Coway Airmega AP-1512HH Mighty.