Review

Coway Airmega 400S Review 2026

Item: Coway Airmega 400S
Author: CleanAir Index

By LanderPilot Editorial TeamOctober 2, 20266 min read

Coway Airmega 400S: product facts and buying notes

This page organizes the supplied air purifiers information: Coway's spec sheet states 3,120 sq ft at 1 air change per hour and 1,560 sq ft at 2 air changes per hour - the two...

Official price US$749.00, checked 2026-10-02. No promotion verified.Visit Coway Airmega 400S official site

Quick Specs

CADR (manufacturer): 328 Smoke / 328 Dust / 400 Pollen
Noise (manufacturer): 22-52 dB(A)
Power consumption (manufacturer): 66 W
Dimensions WxDxH (manufacturer): 14.8 x 14.8 x 22.8 in
Weight (manufacturer): 24.7 lb
Coverage as advertised (manufacturer): 3,120 sq ft at 1 ACH; 1,560 sq ft at 2 ACH
Coverage at 4.8 ACH (computed by us): approximately 650 sq ft
Filtration (manufacturer): two pre-filters + two Max2 HEPA filters
Replacement filter (official): Max2 filter set US$129.00 + pre-filter US$35.00
Official price (checked 2026-10-02): US$749.00

Frequently Asked Questions

Why does this unit need two filters at once?

It is a dual-intake design, so it uses two pre-filters and two Max2 filter sets. The official filter set is US$129.00, which is why the running cost matters more here than on a single-filter unit.

Related Reviews

Coway Airmega Mighty2

Air Purifiers

Coway's own spec sheet lists coverage of 1,800 sq ft at only 1 air change per hour. At the 4.8 air changes per hour...

Official price US$269.99, checked 2026-10-02. No promotion verified.

Official Site Read review

Levoit Core 400S-P

Air Purifiers

Levoit's official listing quotes the room figure at 1 air change per hour (1,718 sq ft), which is about 358 sq ft...

Official price US$189.99, checked 2026-10-02. No promotion verified.

Official Site Read review

Levoit Vital 200S-P

Air Purifiers

Levoit states its 3-stage filtration captures at least 99.97% of 0.3-micron particles, and quotes 1,862 sq ft at 1...

Official price US$199.99, checked 2026-10-02. No promotion verified.

Official Site Read review

Blueair Blue Pure 211i Max

Air Purifiers

The clearest spec sheet of the six: Blueair publishes room size at 4.8 air changes per hour directly (674 sq ft)...

Official price US$262.49, checked 2026-10-02. No promotion verified.

Official Site Read review

Ready to try Coway Airmega 400S?

Coway's spec sheet states 3,120 sq ft at 1 air change per hour and 1,560 sq ft at 2 air changes per hour - the two...

Visit Coway Airmega 400S official site