Coway Airmega 400
Coway's largest single-room air purifier — manufacturer-published CADR 328 smoke / 328 dust / 400 pollen CFM and a 1,560 sq ft coverage claim at 2 air changes per hour, the highest single-unit coverage on the site.
Check Price on AmazonThe verdict
Coway publishes a CADR of 328 smoke / 328 dust / 400 pollen CFM for the Airmega 400 with a 1,560 sq ft coverage claim at 2 air changes per hour, the highest single-unit coverage in the PureAirPick set. That makes it the right pick for an open-plan living room, finished basement, or any space large enough that two smaller units would otherwise be needed. The trade-off is price: at a manufacturer MSRP of $649, the Airmega 400 is roughly 3x the cost of the next-largest unit on the site and lacks Wi-Fi or app control. Recommended for buyers prioritising coverage and smoke or wildfire-smoke CADR over connectivity or lowest absolute cost; smaller spaces are better served by the Coway AP-1512HH.
Full specifications
Pros & cons
Strengths
- Manufacturer-published CADR of 328 smoke / 328 dust / 400 pollen CFM — the highest single-unit CADR set on the site, roughly 30% above the next-largest unit (Honeywell HPA300 at 250 smoke CFM).
- Coway's coverage claim of 1,560 sq ft at 2 ACH is the highest single-room coverage in the PureAirPick set, suited to open-plan living rooms and finished basements where two smaller units would otherwise be needed.
- Two-stage filter design pairs a washable pre-filter with the Max2 cartridge (activated carbon plus True HEPA), with manufacturer-stated 6 to 12 month replacement interval.
- Auto mode and a built-in air-quality sensor allow the unit to step fan speed down when the room is clean; Coway's product page names the sensor as the driver of auto mode.
- Energy Star certified at 66 W maximum draw, comparable to the Honeywell HPA300 despite roughly 30% higher peak CADR.
Caveats
- Coway's MSRP of $649 is roughly 3x the next-most-expensive product on the site (Honeywell HPA300 at $219.99) — cost-per-CFM is competitive but the absolute outlay is the highest in the catalog.
- No Wi-Fi or app connectivity per Coway's own product page; remote scheduling and smart-home integration require the Airmega 400S variant.
- Two-stage filter design funnels all filtration through one Max2 cartridge, so replacement filter cost runs higher than for smaller Coway models like the AP-1512HH.
Ready to buy the Coway Airmega 400?
Check Price on AmazonData sourced from AHAM Verifide, Manufacturer site. CADR figures are AHAM Verifide certified. Last updated .