Which models does the Coway Airmega 400 Max2 filter set fit?

It fits Coway Airmega 400, Coway Airmega 400S. It does not fit ⚠️ Coway Airmega 300 and 300S — UNRESOLVED, and we are not going to pretend otherwise. Coway's own product page for this set names the 400 and 400S and does not list the 300 series; a genuine Coway listing on Amazon is titled for "400/400S and 300/300S". The support article that covers all four models returned HTTP 403 when we tried to read it. If you have a 300 or a 300S, compare the filter already in your machine with the one you are about to order before opening the packaging., Coway Airmega 250 and Airmega Icon — both have their own Max2 filter, sold as their own product. Same family name, different machine, different part., Coway Airmega AP-1512HH (the Mighty) — a different range entirely, with its own two-piece filter set..

Coway Airmega 400 Max2 filter set

Q: What is the part number for the Coway Airmega 400 Max2 filter set?

3104756, AP-2015-FP, ⚠️ "Max2" IS A FAMILY NAME, NOT A PART. Coway sells an Airmega 250 Max2 filter and an Airmega Icon Max2 filter as separate products. Searching for "Max2" on its own will show you filters for machines that are not yours..

By the NestyFinds editorial team · Researched from manufacturer documentation, manuals and the AHAM Verifide directory · Reviewed: September 2026

The part you need

3104756 · AP-2015-FP · ⚠️ "Max2" IS A FAMILY NAME, NOT A PART. Coway sells an Airmega 250 Max2 filter and an Airmega Icon Max2 filter as separate products. Searching for "Max2" on its own will show you filters for machines that are not yours.

Coway's combined cartridge for its large twin-intake towers.

Coway says: "Filter Life Expectancy is 12 Months", per Coway's product page for the set.

Check current price

Price, seller and package contents change. Check the variant on Amazon before you buy.

Does it fit your unit?

Fits these models

Coway Airmega 400
Coway Airmega 400S

Does NOT fit — commonly confused

⚠️ Coway Airmega 300 and 300S — UNRESOLVED, and we are not going to pretend otherwise. Coway's own product page for this set names the 400 and 400S and does not list the 300 series; a genuine Coway listing on Amazon is titled for "400/400S and 300/300S". The support article that covers all four models returned HTTP 403 when we tried to read it. If you have a 300 or a 300S, compare the filter already in your machine with the one you are about to order before opening the packaging.
Coway Airmega 250 and Airmega Icon — both have their own Max2 filter, sold as their own product. Same family name, different machine, different part.
Coway Airmega AP-1512HH (the Mighty) — a different range entirely, with its own two-piece filter set.

Variants Coway sells

Airmega 400 Pre-Filter — a SEPARATE purchase, described by Coway as "easy to clean and reusable". ⚠️ It is sold ONE per order and the machine takes two: Coway's own instruction is "To replace both pre-filters, please enter '2' in the quantity box." That is the second quantity trap on the same machine.
There is no media variant of the Max2 for this model — no smoke or pet version. One cartridge, one specification.

Units we have researched that take this filter: Coway Airmega 400 .

What each part number is

3104756: "Airmega 400•400S Max2 Filter Set". The set contains TWO filters, and that is not an upsell: Coway's own wording is "Each filter set contains two Max2 filters, one for each side of your Coway Airmega."
AP-2015-FP: the SAME part, identified that way on Amazon. Coway's own store calls it 3104756. Two codes for one filter depending on the channel you buy through: match either, and do not assume a listing quoting one is a different product from a listing quoting the other.

What the manufacturer documents

What is in the set

Coway's combined cartridge for its large twin-intake towers. The Max2 is an all-in-one element: Coway describes it as combining HEPA filter technology with an activated carbon filter in a single unit, so the particle stage and the odour stage are replaced together and cannot be bought separately.

The unit draws air through both sides, which is why it takes two of them. Buying one filter for an Airmega 400 leaves half the machine unserviced.

The washable pre-filter is a SEPARATE product, and there are two of those as well.

How often to change it

"Filter Life Expectancy is 12 Months", per Coway's product page for the set.

Coway does not publish an hours-per-day assumption behind that figure on this page, so it cannot be scaled arithmetically to your own use. Note also that the interval applies to the Max2 element; the pre-filter is a separate part with its own maintenance, and being washable it is the one that costs nothing to look after.

Coway’s page for this filter

Genuine vs third-party filters

Coway publishes no position on third-party filters for this model that we could locate, so none is summarised here. As everywhere in this category, no replacement filter carries an independent performance measurement, so there is no comparison to report — only the absence of one.

That is Coway’s stated position, reported as theirs. We have not tested third-party filters and make no claim about how well they work.

When something goes wrong

Symptom	Why it happens	What to do
Ordering one filter and finding half the machine still has the old one.	The Airmega 400 draws air through both sides and takes two Max2 elements. The set contains two for that reason.	Order the SET, not a filter. If a listing offers a single Max2, it is half of what this machine needs.
Ordering one pre-filter for the same reason.	The pre-filter is a separate product AND it is sold singly, while the unit takes two.	Coway's own note is to enter 2 in the quantity box. The pre-filter is washable, so this is a purchase you should rarely have to repeat.
Buying a Max2 filter that turns out to be for a different Airmega.	Max2 is the name of a filter family across several Coway machines, not a part number.	Match the model in the product name — "Airmega 400•400S Max2 Filter Set" — or the SKU 3104756. The word Max2 alone identifies nothing.
Owning a 300 or 300S and not knowing whether this set fits.	Coway's filter page names only the 400 and 400S; a genuine Coway listing on Amazon names the 300 series too. The two disagree and the support article that would settle it was not readable.	Do not resolve it from a listing. Compare the filter in your machine with the product photograph and dimensions, and keep the packaging sealed until you have.