Air Purifier Filter Cross-Reference Guide: Which Aftermarket Filters Actually Fit Your Model (2026)

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If you've ever held a dirty air purifier filter in one hand and a lower-cost two-pack listing in the other, wondering whether it will actually fit, this air purifier filter cross-reference guide is the shortcut, and it pairs with our guide to replacing air purifier filters. The model name on the front grille of a Coway, Levoit or Blueair isn't always the exact model string a seller's replacement chart uses, so check the rating label on the unit itself.

Take the Coway AP-1512HH (Mighty): Coway pairs its HEPA filter with a separate deodorization (carbon) filter, so an aftermarket listing that says "AP-1512HH compatible" can seat perfectly and still shortchange the carbon stage if that stage is only a thin coated layer. It fits, and it's incomplete. That's the core problem this guide solves: physical fit is only half the story.

What follows is a model-by-model cross-reference built around the exact OEM filter SKU first, then the aftermarket options that explicitly list your purifier. I cover Levoit, Coway, Winix, Blueair, Honeywell, Dyson, Shark, Medify, Alen, and Rabbit Air — the brands owners ask about most.

If you already know your purifier model, jump straight to the matching section. If you only know the brand, start with the next section and let the label on your unit do the work.

The One Rule That Prevents Most Filter Order Mistakes

Before we get to the charts, internalize this: the exact suffix on your purifier matters more than the brand or model family. Two Blueair purifiers whose names share the same number can use different filters, so match the full model name, suffix included, against the filter's compatibility list.

The same trap appears on Levoit Core 300 vs. Core 300-P, Coway AP-1512HH vs. AP-1512HHS, and Winix 5500-2 vs. 5510. In every case, the filter may look similar, but the cartridge, seals, and carbon stage differ.

Here's the verification order to follow:

1. Read the label on the purifier itself — model, suffix, and sometimes the original filter part number are printed on a sticker.
2. Check the original manual — it names the authoritative OEM part.
3. Look at the old filter frame — many OEM filters print their SKU directly on the plastic.
4. Use the manufacturer's current filter-finder page — this catches renamed and superseded SKUs.
5. Only then look at aftermarket listings — a seller claiming fit is not the same as a manufacturer confirming it.

Physical fit is necessary but insufficient. A slightly undersized filter can create bypass around the media. A different gasket material can leak. A filter that seats correctly but omits the carbon stage is not a full replacement, no matter how well it snaps in.

How to Find Your Exact Filter Model in 60 Seconds

If you're standing in front of the purifier right now, do this:

• Turn the unit around and look for a label on the back, bottom, or inside the filter door.
• Note the full model string, including suffixes like -P, +, S, or i.
• Open the filter compartment and remove the old filter. Look for a printed part number on the frame.
• Write down the filter SKU. That's the number you'll match against the charts below.

Most purifiers also have a serial-number sticker near the power cord. The model format on that sticker is the one to trust — not the marketing name on the front grille.

For the brands below, the tables list the current OEM filter, its SKU aliases, and the aftermarket options that explicitly cross-reference your exact model. When an aftermarket listing uses "H13" or "MERV 13" language, treat that as a seller claim unless an independent test report is available. The same goes for carbon content: "activated carbon" can mean a thin coated sheet, a pellet bed, or something in between.

Levoit Core 300 / Core 300-P / Core 300S-P

The Levoit Core 300 family uses a cylindrical three-stage cartridge: pre-filter, main particulate filter, and high-density activated carbon. The current OEM filter is the Core 300-RF, and Levoit explicitly lists it for the Core 300-P and Core 300S-P. Older product pages sometimes omit "Core 300S," which is confusing because the current two-pack page supports it.

OEM filter: Levoit Core 300-RF (also sold in Pet Allergy -PA and Toxin Absorber -TX variants). Levoit states 99.97% removal of particles down to 0.3 µm and recommends replacement every 6–8 months depending on use.

Fit warning: Do not confuse this cylinder with the Core Mini-RF, Core 200S-RF, Core 400S, or Vital-series filters. All are different diameters and heights. The common Core 300 cartridge measures roughly 7.59 inches in diameter by 5.79 inches tall, but always verify against your old filter.

One more Levoit note: their filter-life algorithm is designed around genuine filters. If you run an aftermarket cartridge, the replacement indicator may assume more life is left than actually remains, so watch airflow and visible dust rather than relying solely on the light.

Levoit Core 400S-P

The Core 400S uses a larger, different filter than the Core 300. The current OEM standard replacement is commonly sold as Core 400S-RF, but Levoit's direct site now identifies the filter model simply as Core 400S. Official compatibility is Core 400S-P only.

OEM filter: Core 400S-RF (three-stage: pre-filter, high-density activated carbon, particulate stage). Levoit describes the carbon as ARC Formula with significantly more carbon than many competitors. Specialty versions include Pet Allergy (LRF-C401-YUS) and Toxin Absorber (LRF-C401-P-GUS).

Fit warning: Core 300 and Core 400S filters are completely different sizes despite sharing the Core name. Also, some sellers list the Core 400S filter as "Core400S-RF" while Levoit's current site simply says "Core 400S." Treat any marketplace "MERV 13" claim as seller metadata, not an OEM specification.

Coway Airmega Mighty AP-1512HH / Airmega 200M

Coway's AP-1512HH Mighty and Airmega 200M share the same current OEM filter set. The official SKUs are 3304899, 3109905, and 3118096 — all three appear on Coway's product page as aliases.

The set contains:

• 1 HEPA filter (99.97% at 0.3 µm, replace ~12 months)
• 2 deodorization/carbon filters (replace ~6 months)

The washable mesh pre-filter is permanent and cleaned, not replaced.

Fit warning: AP-1512HH and 200M share filters, but the newer AP-1512HHS / MightyS uses a different rigid prefilter configuration. Do not assume interchangeability based on a similar chassis. A historical part number 3304924 floats around some secondary references, but Coway's current page does not list it; use the three SKUs above.

Winix 5500-2

The Winix 5500-2 uses Filter H — SKU 116130. The OEM package includes a True HEPA filter plus a washable AOC pellet-carbon frame. Winix recommends full replacement roughly every 12 months, with the carbon stage washable during that interval.

The 5500-2 has been superseded by the 5510/5520, but those cartridges are not interchangeable with Filter H.

Fit warning: Filter A 115115 is the 5300-2 kit, not the 5500-2 kit. They look similar, and the HEPA insert may physically seat, but Filter A uses four thin carbon sheets while Filter H uses the washable AOC pellet-carbon frame. "It fits" does not make it a full equivalent. Also, Filter H does not officially fit the Winix 5510 — community hands-on testing confirms it does not seat.

Winix 5300-2

The Winix 5300-2 uses Filter A — SKU 115115. The package contains one True HEPA filter and four activated-carbon sheet filters. HEPA replacement is about 12 months; carbon sheets roughly every 3 months.

Official Filter A compatibility extends beyond the 5300-2 to the C535, 5300, 6300/6300-2, AM90, C909, 9800, and others.

Fit warning: The US 5300-2 listing is distinct from the European 5300-2 listing. Regional listings can create false compatibility signals. Always purchase by OEM SKU and carbon-stage design, not by chassis dimensions.

Blueair Blue Pure 311i Max

This is one of the highest-value warnings in this entire guide: Blue Pure 311i Max and 311i+ Max use different filter families.

• 311i Max → F3MAX / Blueair part number 110037
• 311i+ Max → F3MAX+

They are not interchangeable. Blueair's own filter pages tell users to check the interior model label before buying. The standard 311i Max filter includes particle media plus activated carbon; SmokeBlock doubles the carbon, and AllergenBlock is an alternative formulation.

Fit warning: The Smilyan listing explicitly states it is NOT compatible with 311i+ Max, 311 Auto, or original 311. That level of specificity is exactly what you want to see before ordering.

Honeywell HPA300 / HPA304

The Honeywell HPA300-series requires three Filter R elements simultaneously. The OEM packaging tells you the quantity:

• HRF-R1 = one R filter
• HRF-R2 = two R filters
• HRF-R3 = three R filters

A complete HPA300 HEPA change uses HRF-R3. Each R filter measures 6.5 × 1.6 × 10.2 inches. Separately, the carbon stage is Filter A (HRF-AP1) or the household gas/odor HRF-APP1 version, replaced about every three months.

Fit warning: "R filter" is one physical filter; R1/R2/R3 denote pack quantity, not three different sizes. HPA300 needs three R filters, HPA200 needs two, HPA100 needs one. A cheap six-pack of R filters is not a complete maintenance kit — the carbon A prefilter is a separate component.

Dyson Purifier Cool TP07

Dyson's current US OEM standard filter is the 360° Glass HEPA and Activated Carbon Filter, Part No. 965432-01. Dyson recommends replacement about every 12 months or when the machine notifies you.

An official upgrade is the 360° Combi HEPA + K-Carbon, Part No. 974527-01, which is H13-grade HEPA with K-Carbon for improved NO₂ adsorption. Both are combined cartridges, not separate layers.

Fit warning: Older listings reference Dyson part numbers like 970341-01 or older Pure Cool generations. Those are not the primary TP07 reference. Dyson filter compatibility varies by generation even when tower bodies look similar, and regional catalogs may differ. Use Dyson's serial/model lookup where possible.

Shark Air Purifier MAX HP202

The Shark HP202 uses the Shark HE2FKBAS Anti-Allergen NANOSEAL True HEPA filter. Official compatibility includes HP200/HP200C, HP201, HP202/HP202C, HP230/231/232, and several HC500-series models.

The filter measures 11.81 × 8.5 × 8.5 inches and weighs 2.84 lbs. Filtration includes NANOSEAL True HEPA plus a carbon Odor Lock layer for household odors and VOCs. Shark claims 99.98% capture based on IEST-RP-CC007.3 at 0.1–0.2 µm. Replacement interval is 6–12 months.

Fit warning: Aftermarket listings often pack multiple HP and HC model numbers into the title. Verify "HP202" explicitly. Some listings state their HP200/HP202 cartridge is not compatible with HP100/HP102/HP132/HC450 families. Newer Shark "NeverChange" models do not use the HP202 filter even if marketplace titles mention HP300/HP302.

Medify Air MA-40

The current Medify MA-40 replacement filter includes a pre-filter, HEPA material, and a substantial pelletized carbon stage. Medify currently describes particle removal down to 0.3 µm rather than emphasizing older H13/H14 marketing language. The historical genuine replacement was MA-40E / MA-40E-1.

Fit warning: Search results mix MA-40, MA-40 2.0, and MA-40 UV. Older H13/H14/Pet filter names still appear in search indexes even though the current direct replacement page simply offers "HEPA." Verify whether your unit is a conventional MA-40 or a UV configuration before buying older stock. Medify says filters should not be washed or vacuumed.

Alen BreatheSmart 45i / BreatheSmart FLEX

Both models use the same B4-family filter platform. Alen explicitly states 45i and FLEX filters are compatible. The naming has a current/legacy split:

• Essential = Pure = B4-Pure / B4-Essential
• Advanced = Fresh = B4-Fresh / B4-Advanced
• Ultimate = Odor = B4-Odor / B4-Ultimate
• B4-VOC / FL-40 VOC/Smoke = discontinued

Alen's H13 True HEPA filters capture 99.9% of particles down to 0.1 µm. The Pure is particulate-only HEPA; Fresh adds activated carbon; Odor adds higher-level carbon/catalyst treatment. Filter life is roughly 9–12 months.

Fit warning: Alen's own dimensions contain an inconsistency: B4 Pure is listed at 14 × 3 × 15 inches while B4 Fresh/Odor are listed at 11 × 3 × 15 inches. Several aftermarket cartridges are roughly 2 inches deep while some OEM support materials describe B4 filters as 3 inches deep. Check the old filter's depth before calling an aftermarket cartridge dimensionally identical.

Rabbit Air MinusA2 SPA-700A / SPA-780A / SPA-780N

Rabbit Air's MinusA2 uses a four-filter replacement kit:

1. Medium filter
2. BioGS HEPA
3. Customized filter (Germ Defense, Toxin Absorber, Pet Allergy, or Odor Remover)
4. Charcoal-based activated-carbon filter

The washable prefilter is separate and should be cleaned monthly. Recommended full replacement is up to 12 months under 24/7 operation.

Fit warning: A listing called "MinusA2 replacement filter" may mean only the HEPA layer. Rabbit Air's annual OEM kit replaces four separate layers. The GoKBNY kit is a full multi-filter replacement and users report good physical fit, but any MERV 16 label is seller metadata — Rabbit Air does not specify MinusA2 filters using MERV. Also, Rabbit Air's broad replacement directory includes AP-1004, while the current kit's technical data explicitly names SPA-700A and SPA-780A/N; AP-1004 owners should verify directly.

What Actually Changes When You Buy Aftermarket

Aftermarket filters aren't universally bad, and some are excellent value. But here's what you're actually evaluating when you swap OEM for a cheaper cartridge:

• Carbon is not binary. A thin coated sheet, a pellet bed, and a high-capacity smoke filter can all be labeled "activated carbon," yet their gas capacity is completely different. The EPA notes that carbon effectiveness depends partly on having a substantial amount of material. A visually full carbon filter is not proof of better performance — carbon grade, density, and airflow all matter.
• Physical fit does not guarantee seal. Slightly undersized media can create bypass around the edges. A different gasket or frame stiffness can leak unfiltered air.
• Filter-life indicators may lie. Levoit's algorithm is designed around genuine filters. Blueair uses RealTrack to estimate life from usage, fan speed, and pollution. Run an aftermarket filter, and the indicator may assume more or less life than reality. Watch airflow and visible dust.
• H13 and MERV claims are often seller marketing. The EPA explicitly states HEPA vs. True HEPA vs. HEPA-Type efficiency values are not based on the MERV rating system. When a marketplace listing says "MERV 13" but the OEM publishes no MERV number, treat that as unverified.
• Review scores measure satisfaction, not efficiency. Users can tell you if a filter fits, smells odd, or makes noise. They cannot tell you the CADR, pressure drop, or HEPA grade without standardized lab testing.

A typical example: two aftermarket filters can both claim to fit a Winix 5500-2. One includes a washable AOC pellet-carbon frame; the other is HEPA-only. Both seat. Only one reproduces what Winix designed the 5500-2 to do for smoke and odor.

Quick Compatibility Reference Table

Frequently Asked Questions

Conclusion

The single most valuable habit you can build is to treat the filter SKU — not the marketing name, not the front grille, not the seller's title — as the thing you match. The suffix matters. The carbon stage matters. The seal matters.

If you're replacing a Levoit Core 300, get the Core 300-RF or a two-pack that explicitly says Core 300-P. If you have a Blueair, make sure you know whether it's the Max or the + Max before you click. If you own a Winix 5500-2, do not let a Filter A listing convince you it's the same thing.

For more on what makes a filter last, read our guide to filter replacement timing, our breakdown of HEPA vs. True HEPA vs. HEPA-type, and our explanation of CADR ratings. If you're weighing whether an aftermarket filter might affect your warranty, see the air purifier warranty guide.

The right filter is rarely the cheapest listing — it's the one that fits your exact model and reproduces the filtration stages your purifier was designed to deliver.