Coway Airmega 400 replacement filter

Does your exact model share this filter?

Coway labels several versions of the Airmega 400. Check the label on your unit.

• Airmega 400 takes 3104756
• 400S same filter

Look-alike models that take a different filter

The Airmega 300 uses a smaller Max2 set (3104757); the 250 and 230/240 take single Max2 filters of other sizes.

Other genuine options from Coway

Variants and kits the maker sells for this model. Same fit, different media or packaging.

• Airmega 400 Pre-Filter (one per order; the unit has two)
  3121332 · Find on Amazon

Sources

High confidence: the manufacturer names this exact model on a live page. Each line is the page we read and the day we read it.

• Which filter fits cowaymega.com Maker's own page checked Oct 1, 2026

  Airmega 400•400S Max2 Filter Set ... Each filter set contains two Max2 filters, one for each side of your Coway Airmega

• How many cowaymega.com Maker's own page checked Oct 1, 2026

  Each filter set contains two Max2 filters, one for each side of your Coway Airmega

• How often cowaymega.com Maker's own page checked Oct 1, 2026

  Filter Life Expectancy is 12 Months

• What's in it cowaymega.com Maker's own page checked Oct 1, 2026

  The Coway Airmega Max2 filter is an all-in-one HEPA filter system that combines HEPA filter technology with an activated carbon filter

• Other genuine options cowaymega.com Maker's own page checked Oct 1, 2026

  Airmega 400 Pre-Filter, sku 00003121332 ... One pre-filter per order. To replace both pre-filters, please enter "2"