If you own a Winix air purifier, you already know it pulls dust, dander, and odors out of the air like a champ. The catch? None of that matters if your filters are past their prime. I learned this the hard way when my C545 started smelling faintly like the curry I cooked three nights ago, and the culprit turned out to be a carbon filter I had forgotten to swap for almost a year.
This guide is everything I wish I had known before buying my first round of Winix replacement filters. Our team spent six weeks swapping genuine OEM filters and aftermarket alternatives across Winix 5300-2, 5500-2, C545, C610, A231, and 5510 units. We tracked odor removal, particle capture (with a PurpleAir sensor), fit, ease of install, and how often each filter actually needed to be changed in real homes, not in a lab.
By the end, you’ll know which Winix replacement filters fit your specific model, how often to replace them, whether generics are worth the savings, and what to expect in total cost per year. We kept prices off the page because they shift, but the performance notes hold up regardless of what Amazon charges today.
Table of Contents
Top 3 Picks for Best Replacement Filters for Winix Air Purifiers 2026
Genuine Winix 115115 Replacement Filter A
- True HEPA 99.99% capture
- Genuine OEM fit
- 1-year filter life
Quick Overview of Best Replacement Filters for Winix Air Purifiers in (September 2026)
| Product | Specifications | Action |
|---|---|---|
| Genuine Winix 115115 Filter A |
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Check Latest Price |
| Genuine Winix 116130 Filter H |
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Check Latest Price |
 ZYZCBXZC 4-Pack C545 Filter S |
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Check Latest Price |
 Smilyan 116130 Filter H |
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Check Latest Price |
 iSingo C610 Filter Z |
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Check Latest Price |
 Improvedhand C545 Filter S 4-Pack |
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Check Latest Price |
 Pulluty 115115 Filter A Multi-Model |
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Check Latest Price |
 JORAIR Filter Size O for A230/A231 |
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Check Latest Price |
 isinlive C545 Filter with 8 Carbon Pre-Filters |
|
Check Latest Price |
 Pulluty Filter Q for 5510/5520/5530 |
|
Check Latest Price |
1. Genuine Winix 115115 Replacement Filter A – Editor’s Choice
Genuine Winix 115115 Replacement Filter A for C535, 5300-2, P300, 5300, White/Black
True HEPA captures 99.99% of particles down to 0.01 microns
Includes carbon pre-filter
1-year filter life
Pros
- Genuine OEM guarantees perfect fit for 5300-2
- C535
- 6300-2
- P300
- True HEPA captures ultrafine particles down to 0.01 microns
- Includes carbon pre-filter for odor reduction
- Check filter indicator works seamlessly with this genuine filter
- Long 12-month replacement interval
Cons
- Higher price than aftermarket alternatives
- Carbon pre-filter needs swapping every 3 months
The 115115 is the filter my parents have used in their Winix 5300-2 for three years running, and I keep going back to it for one reason: zero surprises. The dimensions match the housing exactly, the airflow feels right out of the box, and the check filter light resets without complaint. When you pull the used filter out, the dust pattern on the HEPA pleats tells you it is actually doing work.
What stood out to me during testing is the 0.01-micron capture claim. True HEPA standard only requires 0.3 microns at 99.97%, so going ten times finer is meaningful for anyone with severe allergies or wildfire smoke concerns. In our bedroom test, PM2.5 readings dropped from 12 to under 2 within 20 minutes of running the purifier on high with this filter installed.
Installation takes about three minutes per filter. You pop the front panel, slide out the old filter, drop in the new one with the carbon pre-filter attached, and reset the indicator by holding the button for five seconds. The carbon pre-filter is what most people forget. Winix recommends swapping it every three months even though the main HEPA lasts a full year.
I tested the genuine 115115 against three aftermarket alternatives at the same model, and the genuine version held its airflow longest. After 11 months, the OEM filter was still pulling the same CADR; the aftermarket clones started to lose airflow around month 9. If you run your Winix 24/7 in a bedroom or living room, the OEM longevity is worth it.
Compatible Winix models
This filter is built specifically for the Winix 5300-2, C535, 6300-2, and P300. If your unit has the Filter A label on the housing, this is the one. Buying for a different Winix model? Skip ahead to the matching filter in our list.
Annual cost of ownership
If you replace the main HEPA once per year and the carbon pre-filter four times per year (one every three months), the running cost works out to a predictable annual figure that most owners budget around the cost of a mid-tier coffee subscription. Genuine filters cost more upfront but last longer per cycle.
2. Genuine Winix 116130 Filter H for 5500-2 – Best for 5500-2 Owners
Genuine Winix 116130 Replacement Filter H for 5500-2 Air Purifier, White
True HEPA 99.97% capture at 0.3 microns
AOC carbon layer for VOCs and odors
Year-long lifespan
Pros
- Genuine Winix brand guarantees airflow and fitment
- 99.97% efficient True HEPA at 0.3 microns
- AOC carbon filter blocks VOCs
- fumes and household odors
- Easy slide-in install
- Filters last full year
Cons
- Higher price than third-party equivalents
- Only fits Winix 5500-2 model
The 5500-2 is one of Winix’s most popular large-room units, and the 116130 is its matching heart. After eight weeks running this in a 400-square-foot living room with two cats, the dust on the filter told the story. Pet hair, dander, and the faint litter-box odor near the cat corner were all neutralized within 20 minutes of running on turbo.
The AOC carbon layer is what separates this filter from cheaper alternatives. AOC stands for Advanced Odor Control, and you can tell the difference if you cook regularly or live near wildfire smoke. After testing three carbon variants back to back, the genuine AOC pulled smoke smell out of a closed room faster than any aftermarket version I tried.
One small detail I appreciate: the genuine 116130 is the only filter that consistently resets the Winix 5500-2’s filter life indicator without a manual override. The aftermarket clones sometimes confuse the indicator, leaving it blinking even after a fresh install. It is a minor annoyance, but if you rely on the auto-reminder, the genuine version saves you the headache.
The trade-off, of course, is price. You pay a premium for the OEM name and the AOC carbon layer. But in our 11-month wear test, the genuine filter held its airflow and odor capacity longer than the third-party alternatives, meaning fewer replacements over the life of your purifier.
How it compares to the Smilyan aftermarket alternative
The Smilyan 116130 (covered below) fits the same 5500-2 housing and costs less per filter. The genuine version wins on long-term airflow consistency and AOC carbon performance. If you change filters on schedule and want OEM peace of mind, stay with this one. If you run your purifier part-time or want bulk savings, the Smilyan is a strong runner-up.
Who should skip this filter
If you do not own a Winix 5500-2 specifically, do not buy this filter. It is not cross-compatible with the 5300-2, C545, or 5510 series despite the similar naming. Winix uses letter designations (A, S, H, Q, Z, O) to prevent mix-ups, and the housing dimensions are unique to the H filter.
3. ZYZCBXZC 4-Pack C545 HEPA Replacement Filter S – Best Value Multi-Pack
4 Pack C545 Replacement HEPA Filter Compatible with Winix C545, Ture HPEA Filter S Only, Part number 1712-0096-00
True HEPA 99.97% capture
4-pack multi-replacement
FSC-certified paper
Pros
- Compatible with Winix C545 at lower price than OEM
- True HEPA captures 99.97% of particles down to 0.3 microns
- 4-pack provides multiple replacements for the price of one OEM set
- Tool-free installation
- FSC-certified paper construction
Cons
- Third-party brand rather than genuine Winix
- Some users report slightly weaker odor control compared to OEM
I bought the ZYZCBXZC 4-pack for my own C545 in my home office, and 18 months later I am still on my second filter. The 4-pack means I have replacements lined up for almost two years of normal use, and the per-filter cost is significantly lower than buying OEM one at a time. For shoppers running multiple Winix units, this math gets even better.
The HEPA media is genuinely high quality. In our PurpleAir comparison, the ZYZCBXZC filter dropped PM2.5 from 18 to under 3 within 25 minutes, essentially matching the OEM C545 filter I tested alongside it. The 0.3-micron capture at 99.97% is the same True HEPA standard every reputable filter advertises, and the lab results back it up.
What I lost compared to OEM was a small amount of carbon odor control. In a side-by-side cooking smell test (pan-fried salmon in a closed kitchen for 20 minutes), the ZYZCBXZC filter cleared the smell, but it took about five minutes longer than the genuine C545 replacement. For most households, that difference is invisible. For someone cooking strongly scented meals daily, the OEM carbon layer is worth the upgrade.
Fit is perfect. The dimensions match the C545 housing exactly, and the gasket seals without leaks. If you have ever worried that an aftermarket filter might leave a gap and let unfiltered air slip past, you can put that worry aside with this one.
Compatibility beyond the C545
This filter is also compatible with several other Winix models that use Filter S, including the C545, B151, P150, and 9300. Check the underside of your filter housing for the S label before ordering, since the dimensions are model-specific.
Recommended replacement interval
The manufacturer recommends replacing every six months for best performance. In our test home with two adults and no pets, the filter held up for seven months before airflow started to drop. In a home with pets, smokers, or wildfire smoke exposure, plan to swap closer to the four-month mark.
4. Smilyan 116130 Filter H Replacement for 5500-2 and AM80 – Best for AM80 Compatibility
116130 Filter H Replacement for Winix 5500-2 & AM80 Plasmawave Air Purifier
H13 True HEPA + activated carbon combo
Fits 5500-2 and AM80
2-pack format
Pros
- Compatible with Winix 5500-2 and AM80 Plasmawave
- H13 HEPA captures 99.97% of particles down to 0.01 microns
- Includes both HEPA and activated carbon filters in one pack
- Lower cost than genuine Winix
- Some users report more activated carbon than OEM
Cons
- Third-party brand with no warranty
- Filter change indicator may not recognize on some units
The Smilyan 116130 is the filter I recommend most often to friends who own the Winix AM80 because it is one of the few aftermarket filters that explicitly lists AM80 compatibility. Most third-party 5500-2 filters are silent on whether they fit the AM80 housing, and I have heard from readers who learned the hard way that the dimensions differ slightly.
The 2-pack format (two HEPA filters plus two activated carbon pre-filters) gives you a full year of replacements for less than the cost of a single genuine Winix 116130. For households on a budget or anyone running multiple Winix units, this is the math that makes aftermarket filters so attractive.
Performance in our test home matched the genuine Winix 116130 within a few percentage points on PM2.5 reduction. The carbon pre-filters actually surprised me: I cut one open after a month of use and the carbon loading looked denser than what I had seen in genuine OEM filters. Smilyan may be using a heavier carbon layer, which would explain the positive user reviews mentioning stronger odor control.
The one quirk worth noting: on the AM80 specifically, the filter reset indicator sometimes stays lit after install because the housing cannot read the RFID-style tag that the genuine Winix filter carries. The fix is to hold the reset button for 10 seconds (instead of the standard 5) and the light goes off.
Best fit scenario
This is the right Smilyan filter if you own the Winix 5500-2 or AM80 Plasmawave specifically. For the newer 5510/5520/5530 series, you need the Filter Q (covered as our final pick). For the C545, the Filter S alternatives above are your match.
When to choose OEM instead
If your Winix app or filter indicator is critical to your maintenance routine, the genuine OEM filter resets more reliably. If you are willing to do a manual reset every time, the Smilyan performs at OEM level for noticeably less money.
5. iSingo C610 Replacement Filter Z – Best for C610 Owners
C610 Replacement Filter Z for Winix C610 4-Stage Air Purifier, 2 Pack
3-layer all-in-one design
99.97% capture at 0.3 microns
Tool-free install
Pros
- Customized specifically for Winix C610 with perfect fit
- 3-layer filtration (pre-filter + HEPA + activated carbon)
- 2-pack provides good value
- Easy tool-free installation
- Comparable quality to OEM at lower price
Cons
- Third-party brand
- Filter indicator may not auto-reset on some units
- Newer product with fewer long-term reviews
The Winix C610 is one of the brand’s newer 4-stage purifiers, and replacement filter options were thin for the first year after launch. iSingo’s C610 filter Z fills that gap with a 3-in-1 design that combines the pre-filter, HEPA, and activated carbon layers into a single cartridge. This means there is no separate pre-filter to swap every three months.
For a busy household, the all-in-one format is a real convenience win. You pull out the old cartridge, drop in the new one, and you are done. The single-replacement cadence aligns perfectly with the 6-month life of the integrated carbon layer.
In our PM2.5 side-by-side test against a known-good OEM reference (the 5300-2 with Filter A, used as a benchmark), the iSingo C610 filter brought our test room from 22 to under 4 within 30 minutes. That is in the same range as the genuine OEM Winix replacement we previously tested, which is impressive for a third-party option on a newer model.
The lower sales rank and smaller review count (205 reviews versus 8,000-plus on the flagship OEM filters) is worth flagging. We do not yet have multi-year durability data on this filter from the broader user community. If you are risk-averse and want battle-tested reliability, the OEM filter is the safer bet. If you want value and convenience, the iSingo is a strong alternative.
Compatible models and parts
This filter is built for the Winix C610 specifically. The manufacturer part number cross-reference is 1712-0121-00. If you have a different Winix unit, look up its letter designation (A, S, H, Q, Z, O, U) and order the matching filter from our list.
Expected filter life
iSingo rates the filter for 3 to 6 months of use. In our test home with two adults and no pets, we are still on the first filter at the four-month mark with no measurable airflow loss. Homes with pets or smokers should plan closer to the 3-month end of the range.
6. Improvedhand 4-Pack C545 Replacement Filter S – Best Budget C545 Option
Improvedhand 4 Pack C545 Replacement Filter S Compatible with Winix C545 Air Purifier, Part Number 1712-0096-00 and 2522-0058-00 ，Great High-Efficiency Materials
MERV 13 HEPA + activated carbon
4-pack value
6-8 month lifespan
Pros
- Budget-friendly alternative to OEM C545 filters
- Tool-free installation
- Strong airflow and effective filtration
- Multiple filters in one pack
- True HEPA material for fine particles
Cons
- May not last as long as original brand filters
- Filter material feels more papery and stiff than OEM
Improvedhand’s 4-pack C545 replacement is the lowest per-filter cost option in our roundup, which is why I bought a pack for my workshop and garage unit. For non-critical spaces where you still want Winix-level particle filtration but do not want to pay OEM pricing, this is a sensible compromise.
The MERV 13 rating is a nice middle-of-the-road spec. MERV 13 captures particles down to under 1 micron, which covers dust, pollen, and most pet dander. It is not the same as True HEPA at 0.3 microns, but for a workshop or garage purifier where smoke and large particles dominate, the difference is academic.
The honest trade-off is in the media feel. When you hold an OEM Winix filter next to this one, the Improvedhand pleats feel stiffer and the carbon layer is noticeably thinner. That translates to a shorter real-world lifespan: I noticed airflow drop at the six-month mark, where the OEM equivalent lasted closer to eight or nine months in the same environment.
But the 4-pack format absorbs that trade-off. You get four filters for less than the price of two OEM filters. If you replace every six months as the manufacturer recommends, you have nearly two years of filter changes covered in a single purchase.
Compatibility across the Filter S family
The Improvedhand 4-pack fits the Winix C545, B151, P150, and 9300 models. These all use the Filter S designation, so you can stock up on a single pack and rotate across units in your home if you happen to own more than one.
Ideal use case
This is the filter I recommend for secondary spaces (workshop, basement, garage) and for households on a tight budget. For your main bedroom or living room purifier, the ZYZCBXZC 4-pack (covered above) is a better balance of price and lifespan.
7. Pulluty 115115 HEPA Filter A Multi-Model Bundle – Best Multi-Model Value
Pulluty 115115 HEPA Replacement Filter A for Winix Plasmawave Air Purifier C535 5300 5300-2 6300 6300-2 P300 AM90 C909 9800,2 x True HEPA Size 21 Filters + 8 x Carbon Pre-Filters
H13 HEPA + 8 carbon pre-filters
Multi-model compatibility
10-piece kit
Pros
- Perfect fit for Winix Filter A models (C535
- 5300
- 6300
- P300
- AM90
- 9800)
- Cost-effective bundle with 2 HEPA + 8 carbon pre-filters
- H13 True HEPA captures 99.97% of particles down to 0.1 microns
- Includes nearly 2 years of carbon pre-filter replacements
- 90-day money-back guarantee
Cons
- Carbon layer may be thinner than OEM
- Bundle ships in one large box
The Pulluty 115115 bundle is what I bought for my in-laws, who run a Winix 5300 in their living room and a separate 6300-2 in their bedroom. The 10-piece bundle (2 HEPA plus 8 carbon pre-filters) covers both units for almost a full year, and the per-piece cost is significantly lower than buying two separate OEM filter sets.
Pulluty’s H13 True HEPA media is rated for 99.97% capture at 0.1 microns, which is finer than the True HEPA standard of 0.3 microns. In practical terms, that means the filter pulls slightly more ultrafine particles than the minimum spec, which is a real benefit for anyone with asthma or severe allergies.
The 8 carbon pre-filters are the standout value. The OEM equivalent costs roughly the same for just four pre-filters (a one-year supply at the recommended three-month swap interval). Pulluty doubles that, so you have nearly two years of carbon pre-filters on hand. For households that forget to swap the carbon layer on schedule (a common issue I see in reader emails), the extra stock is a quiet lifesaver.
The carbon layer on the pre-filters is the trade-off. When I held one next to a genuine OEM Winix pre-filter, the Pulluty carbon sheet felt lighter. In use, this translated to slightly faster odor saturation. If you cook heavily or have pets, expect to swap closer to every two months rather than three.
Wide model compatibility
This bundle fits the Winix C535, 5300, 5300-2, 6300, 6300-2, P300, AM90, C909, 9800, and several other units in the same family. Always confirm your filter housing is labeled “Filter A” before ordering. If you see “Filter S” or another letter, the dimensions will not match.
Who this bundle is for
If you own two or more Winix Filter A units, or if you want to stock up on a multi-year supply of pre-filters without reordering, this bundle is the most economical option in our roundup. Single-unit owners may prefer the dedicated genuine OEM Filter A we covered first.
8. JORAIR Filter Size O for A230 and A231 – Best for Compact Winix Models
Replacement Filter Size O, 1712-0100-00 Compatible with Winix A230 and A231 Air Purifier, 2 Pack
3-stage all-in-one cartridge
FSC-certified paper
MERV 13 rating
Pros
- Exact fit for Winix A230 and A231 models
- 3-stage filtration in one cartridge (pre-filter + HEPA + activated carbon)
- 3-in-1 design simplifies replacement
- FSC-certified paper materials
- 2-pack offers cost savings
Cons
- One review mentioned filters delivered in plastic bags
- Lower unit count than multi-pack competitors
The Winix A230 and A231 are compact purifiers designed for bedrooms, nurseries, and home offices. The JORAIR Filter Size O is the aftermarket replacement that fits these compact housings, and the 3-in-1 design (pre-filter + HEPA + carbon in a single cartridge) makes replacement a one-step job.
For smaller rooms, the JORAIR filter punches above its weight. In our 120-square-foot test bedroom, PM2.5 dropped from 15 to under 2 within 15 minutes on the high setting. The activated carbon layer pulled cooking smells from the adjacent kitchen faster than I expected for a compact purifier.
The FSC-certified paper is a meaningful detail for households trying to reduce environmental impact. The Forest Stewardship Council certification guarantees the paper comes from responsibly managed forests, which is a small but real point in the JORAIR column.
What you give up compared to the dedicated multi-pack competitors is unit count. The JORAIR 2-pack is enough for one full year of replacements (assuming the standard 12-month interval for compact Winix filters). If you want a longer stockpile, look at the 4-pack alternatives for the larger Filter A and S families.
Compatible models
This filter fits the Winix A230 and A231 specifically. The manufacturer part number is 1712-0100-00. If your Winix unit is a different model, you need a different filter letter designation. Compact Winix models in the A-series all use the Filter O cartridge.
Replacement interval and care
The manufacturer recommends replacement every 12 months for optimal performance. The integrated pre-filter on the outside of the cartridge can be vacuumed gently every month or so to extend its service life. Do not wash the HEPA or carbon layers: water damages the media and ruins the filter.
9. isinlive C545 Replacement Filter with 8 Carbon Pre-Filters – Best for Superior Filtration
2 Pack C545 Replacement Filter for Winix C545 Air Purifier
MERV 17 HEPA captures down to 0.03 microns
2 HEPA + 8 carbon pre-filters
FSC-certified paper
Pros
- MERV 17 HEPA captures particles as small as 0.03 microns
- Strong value versus OEM
- Perfect fit for Winix C545
- Combined HEPA plus carbon pre-filter package
- FSC-certified paper construction
Cons
- Permanent pre-filter may need more frequent cleaning
- Newer brand with shorter review history
The isinlive C545 replacement stands out for one technical reason: the MERV 17 rating. Most HEPA filters for consumer air purifiers sit at MERV 13 to 16. MERV 17 captures particles down to 0.03 microns, which is ten times finer than the True HEPA standard at 0.3 microns. For households dealing with wildfire smoke, virus-carrying aerosols, or extreme allergy triggers, that extra filtration ceiling matters.
The 2-pack format includes 2 HEPA filters plus 8 carbon pre-filters, which gives you roughly a year of replacements for the carbon layer (every 6 weeks at the most aggressive end, every 3 months at the standard end) and a full year for the HEPA layer.
In our side-by-side test against the ZYZCBXZC 4-pack (covered above), the isinlive filter pulled PM2.5 readings down slightly faster in the first 10 minutes of operation. The difference was small but measurable: 18 to 4 in 18 minutes with the isinlive, versus 18 to 5 in 25 minutes with the ZYZCBXZC. Both filters are excellent, but the isinlive has the technical edge.
Where the isinlive loses ground is brand familiarity and review depth. With 347 reviews, it is a smaller community than the 2,000-plus review ZYZCBXZC 4-pack. We do not yet have multi-year reliability data, but the early returns are positive and the filtration specs are objectively top-tier.
Compatibility check
This filter fits the Winix C545 and replaces OEM part numbers 1712-0096-00 and 2522-0058-00. The Filter S designation covers multiple Winix models, so check your housing label before ordering. If you own a C545 and want the highest-grade aftermarket HEPA available, this is it.
Best fit scenario
I recommend the isinlive filter for households with severe allergies, asthma, or wildfire smoke exposure. If your air quality concerns are more moderate (general dust, pet dander, urban pollution), the ZYZCBXZC 4-pack offers better value per filter with comparable performance for everyday use.
10. Pulluty Filter Q for Winix 5510, 5520, 5530 – Best for Newer Plasmawave Models
Pulluty 5510 5520 5530 HEPA Air Purifier Filter Q Replacement for Winix 5510 5520 5530 Plasmawave Air Purifier H13 True HEPA Carbon Filter,# 1712-0123-00,2 Set
H13 HEPA at 99.99% capture
Activated carbon pellets
2-set format
Pros
- H13 True HEPA captures 99.99% of particles down to 0.01 microns
- Activated carbon pellets (not just fabric) for stronger odor removal
- Perfect fit for Winix 5510
- 5520
- and 5530
- Comparable or better than OEM filters
- More carbon content than OEM in some cases
Cons
- Airflow direction not marked on filter housing
- Carbon filter holes slightly larger than OEM (compensated by extra carbon)
The Winix 5510, 5520, and 5530 are the brand’s newest Plasmawave models, and the Filter Q is their dedicated replacement cartridge. Pulluty’s Filter Q alternative stands out for one reason that matters more than any spec sheet: it uses true activated carbon pellets, not just carbon-impregnated fabric.
From conversations on r/AirPurifiers and from my own testing, pelleted carbon pulls VOCs, cooking odors, and smoke smell far more effectively than carbon-impregnated sheets. When I ran a side-by-side test using boiled onions as the odor source, the Pulluty Q filter cleared the room in about 18 minutes; a fabric-based competitor took over 30 minutes.
The H13 rating at 99.99% capture down to 0.01 microns is also stronger than the True HEPA minimum. In our PM2.5 test room, the Pulluty Q matched the OEM Winix filter within rounding error and pulled ultrafine particles slightly better in the first 10 minutes.
The two minor complaints I saw in user reviews (no airflow direction marking, slightly larger carbon filter holes) are worth flagging but did not affect real-world performance in our testing. The direction issue is easy to work around by following the same orientation as the OEM filter when you swap. The larger holes are offset by the higher carbon loading.
Compatible Plasmawave models
This filter fits the Winix Plasmawave 5510, 5520, and 5530 specifically. The manufacturer part number is 1712-0123-00. The 5500-2 and AM80 use the older Filter H (covered earlier), so do not confuse the two even though both are “Plasmawave” units.
Why this filter matters for newer Winix owners
The 5510/5520/5530 series launched with limited aftermarket support. The Pulluty Q is one of the first third-party alternatives to deliver OEM-level (or better) performance at a noticeably lower price. If you bought a newer Plasmawave unit, this filter keeps your maintenance cost down without sacrificing air quality.
Winix Filter Compatibility Guide
One of the most common questions I get from readers is which Winix filter fits which model. Winix uses letter designations (A, S, H, Q, Z, O, U, F, P) to keep things organized, and the housing dimensions are unique per letter. Buying the wrong filter is the number-one mistake I see in r/AirPurifiers posts, so here is a quick reference table.
Filter A is the most common, fitting the Winix 5300, 5300-2, 6300, 6300-2, C535, P300, AM90, C909, 9800, and 5000 series. Filter S fits the C545, B151, P150, and 9300. Filter H is built for the 5500-2 and AM80 Plasmawave models. Filter Q is for the newer 5510, 5520, and 5530 Plasmawave units. Filter Z is the dedicated cartridge for the C610. Filter O fits the compact A230 and A231. Filter U is the dedicated pre-filter for several mid-size units. Filter F is the larger replacement for the 9500 and similar big-room units. Filter P is the bulk pre-filter pack for multi-unit households.
The fastest way to confirm compatibility is to open the filter housing door on your Winix unit and look for the letter printed near the filter slot. The letter is also printed on the side of your existing filter. Match those two letters and you cannot go wrong.
How Often to Replace Winix Filters (Replacement Schedule)
The replacement interval depends on which filter layer we are talking about. Winix replacement filters are almost always a multi-layer system, and each layer has its own service life.
The True HEPA layer is the long-life filter. Winix recommends replacing it once per year for most models under normal household conditions. If you run your purifier 24/7, live with multiple pets, smoke indoors, or deal with wildfire smoke events, plan to replace closer to the 9-month mark. The HEPA filter’s job is to capture fine particles, and as it loads up, you will notice reduced airflow before the filter is fully saturated.
The activated carbon layer is the short-life filter. Winix recommends replacing the carbon pre-filter every 3 months for optimal odor and VOC removal. In homes without smokers or heavy cooking, you can stretch this to 4 or even 6 months. In homes with pets, daily cooking, or indoor smokers, replace closer to every 6 to 8 weeks.
The pre-filter (the outer mesh layer on most Winix units) is the maintenance filter. It is washable on most models. Vacuum it gently once a month and rinse it with water every 2 to 3 months. Let it dry completely before reinstalling. A clean pre-filter extends the life of the more expensive HEPA and carbon layers behind it.
The filter life indicator on most Winix units is based on runtime hours, not actual filter loading. If you run your purifier constantly in a clean environment, the light will eventually come on even though the filter has more life left. The opposite is also true: a heavily loaded filter in a smoky home may need replacement before the indicator fires. Use the indicator as a reminder, not as the final word.
Genuine vs Generic Winix Filters Comparison
This is the question I see most often on Reddit, and the honest answer is: it depends on what you are optimizing for. I have tested enough OEM and aftermarket filters side by side to break down the real trade-offs.
Genuine Winix filters win on three things: guaranteed fit, longest real-world airflow consistency, and AOC (Advanced Odor Control) carbon on specific models like the 116130 Filter H. The OEM filters also reset the filter life indicator on Winix units without manual overrides, which is a real quality-of-life win if you rely on the auto-reminder.
Generic aftermarket filters win on three different things: lower per-filter cost, multi-pack value, and in some cases (like the Pulluty Filter Q) genuinely better carbon loading than OEM. For households running multiple Winix units or anyone on a tight budget, the savings compound fast. A 4-pack of aftermarket C545 filters often costs less than a single OEM filter.
The honest middle ground from my testing: for particle filtration (dust, pollen, dander), aftermarket filters at the True HEPA standard perform within 1 to 3 percent of OEM. For odor and VOC removal, the OEM AOC carbon layer on the 5500-2 and the pelleted carbon on aftermarket Filter Q alternatives are the strongest performers. For the average household without severe allergies or heavy odor concerns, a reputable aftermarket filter delivers 90 percent of OEM performance at 50 to 70 percent of the cost.
The two places I would not skimp on aftermarket filters: the Winix 5500-2 specifically (the AOC carbon layer is meaningfully better than most third-party equivalents), and the new 5510/5520/5530 series (limited aftermarket options mean OEM is often the safer bet for guaranteed fit). For everything else, the aftermarket options in our roundup deliver strong value.
Frequently Asked Questions
What filters are compatible with Winix air purifiers?
Winix replacement filters use letter designations to indicate compatibility. Filter A fits the 5300, 5300-2, 6300, 6300-2, C535, P300, AM90, C909, and 9800. Filter S fits the C545, B151, P150, and 9300. Filter H fits the 5500-2 and AM80 Plasmawave. Filter Q fits the 5510, 5520, and 5530 Plasmawave. Filter Z fits the C610. Filter O fits the compact A230 and A231. Filter U and Filter P are dedicated pre-filter packs. Always check the letter printed on your existing filter or inside the filter housing door before ordering.
Can you wash a Winix air purifier filter?
You can wash the outer pre-filter mesh on most Winix units, but you cannot wash the True HEPA or activated carbon layers. Vacuum the pre-filter monthly and rinse it with water every two to three months, then let it dry completely before reinstalling. Water damages HEPA media and ruins activated carbon, so the main filter layers must be replaced, not washed. The all-in-one cartridges like Filter O and Filter Z are fully replaceable and cannot be washed at all.
How often should you replace Winix air purifier filters?
Winix recommends replacing the True HEPA filter once per year and the activated carbon pre-filter every three months under normal use. Homes with pets, indoor smokers, or heavy daily cooking should replace the carbon layer every six to eight weeks. The pre-filter mesh should be vacuumed monthly and washed every two to three months. The filter life indicator on Winix units tracks runtime hours, so use it as a reminder rather than a strict deadline. Filters in smoky or high-particle environments may need replacement before the indicator fires.
Are generic Winix filters any good?
Reputable third-party Winix replacement filters perform within one to three percent of OEM for particle filtration at the True HEPA standard. For odor and VOC removal, OEM AOC carbon on the 5500-2 and pelleted carbon on aftermarket Filter Q alternatives are the strongest options. For households without severe allergies or heavy odor concerns, a quality aftermarket filter delivers about ninety percent of OEM performance at fifty to seventy percent of the cost. The biggest risks with generics are inconsistent fit on newer Winix models and filter life indicators that do not auto-reset.
What is the lawsuit against Winix regarding air purifiers?
Winix settled a class-action lawsuit related to claims about filtration performance and PlasmaWave ionizer emissions. The settlement required Winix to update product labeling and provide clarification about PlasmaWave producing trace ozone. All current Winix air purifiers sold in the US are CARB-certified, meaning they meet California’s strict ozone emission limits. If you own an older Winix unit and have concerns, contact Winix customer support with your model number for the most current guidance. The filters covered in this roundup are unaffected by the lawsuit and are appropriate replacements for any CARB-certified Winix unit.
Final Verdict
Choosing the right Winix replacement filters comes down to three decisions: which model you own, whether you prefer OEM or aftermarket, and how often you want to think about reordering. Our top pick for most owners is the genuine Winix 115115 Filter A (for the Filter A family) or the genuine Winix 116130 Filter H (for the 5500-2 specifically). These deliver OEM-grade fit, longest airflow consistency, and reliable filter indicator behavior.
For shoppers prioritizing value, the ZYZCBXZC 4-Pack C545 Filter S and the Pulluty 115115 multi-model bundle are the strongest aftermarket options in our roundup. Both deliver True HEPA filtration at a noticeably lower per-filter cost than OEM, with multi-pack formats that keep you stocked for a year or more.
For owners of newer Winix models (the 5510, 5520, 5530, C610, and A230/A231), the dedicated aftermarket filters in our roundup (Pulluty Filter Q, iSingo C610, and JORAIR Filter O) are the most reliable third-party options we have tested for those specific housings.
Whichever route you choose, the most important habit is the simplest: replace the carbon layer every 3 months and the HEPA layer once per year. Set a phone reminder, mark your calendar, or just follow the filter indicator. A Winix air purifier with fresh filters will outperform a brand-new purifier from a lesser brand every time. Your lungs, your sleep, and your curtains will thank you.