Winix filter range

Winix C545 Filter

Compare replacement filters for Winix C545 series purifiers: single True HEPA swaps, carbon odor filters, pre-filter sheets and multi-packs. Match the stage, room and change schedule to the air your home actually needs.
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Breathe Naturally Filter S Carbon Replacement for Winix C545 Series Air Purifiers, Odor Focus
Designed as a direct carbon swap for Winix C545 series units, this filter focuses on the odor side of the job. Activated carbon layers capture cooking smells, pet odors and everyday household pollutants before they circulate. Fit it when your purifier still moves air well but rooms no longer smell fresh between runs.
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Replacement True HEPA Filter Compatible with Winix C545 Air Purifiers, 99.97% Capture
True HEPA media is the core of this swap, capturing up to 99.97% of airborne particles down to 0.3 microns, including dust, pollen and pet dander. Change it when the unit's filter indicator warns of reduced airflow. A straightforward pick for C545 owners who want full performance restored.
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Winix C545 Replacement Filter 2-Pack with True HEPA and Carbon Stages, Always Ready
Two complete filters arrive together, each pairing a True HEPA layer with activated carbon for odor reduction. The second unit means you swap the moment the first is spent instead of waiting on a reorder. Households that run a purifier daily often find a spare keeps the schedule from slipping.
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Activated Carbon Pre-Filter Sheet Set for Winix C545 Air Purifiers, First-Line Defense
Thin carbon pre-filter sheets sit ahead of the main filter, catching larger particles along with cooking smells and pet odors before they reach the HEPA stage. Because the sheets take the first hit, the primary filter lasts longer and airflow stays steady. Replace them often; they are the cheap line of defense.
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Winix C545 Replacement Filter 4-Pack for Year-Round Air Care in Busy Homes and Bedrooms
Four True HEPA and carbon filters cover roughly a year of typical use in a busy household, so routine changes stop depending on shipping timing. Multi-packs suit homes running purifiers continuously in bedrooms and living spaces where dust and pollen build quickly. Buy once, stay on schedule.
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New filter options

Five C545 filters covering carbon odor, True HEPA, pre-filter sheets and multi-packs, each for a different change habit.
Winix C545 pet odor and dander filter with a dog resting blurred behind it on a wool rug

Winix C545 Pet Odor and Dander Replacement Filter Set with Extra Carbon for Pet Homes

Built for homes with cats and dogs, this set pairs True HEPA filtration with a heavier activated carbon layer to reduce dander, hair odor and litterbox smells where pets rest. It replaces the C545 filter directly, with no adapters to fit. Choose it when pet odor returns before the interval is due.
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Six more ways to choose

More C545 filters matched to specific rooms and tasks

Winix C545 Allergen Relief True HEPA Filter for Pollen and Mold Season in Home Offices

Pollen, mold spores and household dust are the targets here, and the True HEPA stage captures particles down to 0.3 microns. Run it in a bedroom or home office during allergy season, when you spend the most hours indoors. A fresh filter restores the airflow a tired one loses.
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Winix C545 Smoke and Cooking Odor Carbon Filter for Kitchens and Open Rooms, Grease and Smoke

An activated carbon filter made for kitchens and open living areas, this one is formulated to reduce lingering smoke and cooking odors rather than particles alone. Install it ahead of or alongside the True HEPA filter for combined capture and odor control. Suits households that cook often or live with secondhand smoke.
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Winix C545 Replacement Filter Multipack with Washable Outer Mesh for Pet Hair and Large Dust

A reusable outer mesh screen comes with this multipack, catching hair and large dust before air reaches the HEPA and carbon layers. Rinse the mesh between filter changes and the unit keeps steady airflow instead of slowing as debris builds. Extra filters mean the main stages get replaced on time too.
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Winix C545 Bedroom Air Purifier Replacement Filter Kit for Cleaner Sleep Through the Night

Sized for C545 units that run overnight, this kit combines True HEPA filtration for nighttime particle capture with a carbon layer that reduces everyday room odors. Quiet, efficient filtration helps keep air cleaner through the hours you sleep. Choose it when the bedroom is the room that matters most.
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Winix C545 Whole-Room Replacement Filter Bundle for Living Spaces, Pollen and Household Odor

Larger living areas pull more air and collect more dust, so this bundle pairs a True HEPA filter with an activated carbon layer to handle particles and household odors in shared spaces. Fresh filters restore the airflow the purifier needs to circulate clean air across the room. A practical pick for open plans.
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Winix C545 Replacement Filter for High-Dust Homes, Renovation Work and Open Windows

Construction dust, woodworking debris and windows left open all season raise the particle load well above normal. This True HEPA and carbon filter is intended for those conditions, but it should be changed more often than a quiet household cycle. Keep a spare ready and the unit keeps capturing fine particles.
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Where C545 filters make the biggest difference

Rooms stress a filter in different ways. These are the settings buyers shop for most, with the result to expect from each, so you can match the swap to the room you run.
White pleated filter on a bedroom nightstand with a tissue box and morning light on the bed

Allergy season in the bedroom

Fresh True HEPA in the bedroom during pollen season lowers particle counts near the bed. The result is fewer morning symptoms and steadier sleep through the weeks that matter.

Cylindrical filter beside a dog bed on a living room floor with a cat tree blurred behind

Pet rooms and litter areas

Dander, hair odor and litterbox smells collect where pets rest. A filter pairing True HEPA with a heavier carbon layer targets both particles and odor, so rooms pets use stay fresher longer.

Carbon filter on an open-plan kitchen island with a chopping board and steam from a pan behind

Kitchens and open living areas

Cooking odors travel into adjacent rooms, especially in open plans. An activated carbon filter reduces lingering smoke and grease smells while HEPA keeps handling settled dust.

White pleated filter beside a desk with keyboard and monitor edge in window light

Home offices and dusty desks

Desks near windows or workshop doors pick up fine dust that resettles on surfaces within a day. A True HEPA replacement captures those fine particles, so the air at desk level stays cleaner while you work.

Cylindrical filter on a side table in a large living room with sofa and rug behind

Whole-room runs in living spaces

Larger shared rooms move more air and collect pollen, dust and household odors together. A fresh filter restores the airflow needed to circulate cleaned air across the whole room.

Filter with dust on its pleats on a drop cloth near taped furniture and construction dust

Renovation and high-dust periods

Construction and woodworking raise particle levels far above normal, and open windows add pollen. Change the filter more often so the unit keeps capturing fine particles at full capacity.

How to compare

Six factors that decide your filter choice

Cutaway-style view of a white HEPA cartridge and a black carbon layer side by side on a light table

Filter stage matters

HEPA traps particles, carbon handles odors; match both to your rooms.

Replacement filter on the floor of a spacious living room with a sofa and tall window

Room size and airflow

Busy living rooms load a filter faster than quiet bedrooms do.

Gray mesh pre-filter screen lifted above a dust-dulled filter cartridge over a sink

Pre-filter protection

A washable mesh takes the first hit so the HEPA stage lasts longer.

Old gray filter beside a fresh white filter on a table with a small clock nearby

Change interval timing

Filter indicators and room dust set the swap date for your unit.

Four replacement filters in a neat row on a shelf with one pulled forward

Multi-pack value math

Four-packs cover about a year of use, lowering cost per change.

Carbon filter and pleated HEPA filter flanking a plate of cooked food on a counter

Odor or allergen focus

Cooking and pet odors need carbon; pollen and dust need True HEPA.

Three ways to choose

Match the filter to how your rooms get dirty

Black activated carbon cartridge on a kitchen counter near a cutting board and simmering pot
Carbon-heavy filters for odor control

When cooking smells, pets or smoke drive the complaint, choose a heavier activated carbon layer. Carbon tackles odor while HEPA handles particles, so each stage solves a different problem.

White pleated cylindrical filter on a windowsill with an open window and green trees behind
True HEPA swaps for pollen and dust

If seasonal pollen, mold spores or fine dust are the issue, True HEPA is the right direction. These filters capture up to 99.97% of particles at 0.3 microns, the number that matters for allergy season.

Three replacement filters stacked in a small pyramid beside a purifier base in a hallway
Multi-packs for continuous run time

Homes running purifiers all day burn through filters faster than casual use suggests. A two- or four-pack keeps a spare ready, so you swap when the indicator warns rather than waiting to reorder.

From shoppers

What filter buyers say about the swap

I spent a week comparing carbon-only swaps against full HEPA replacements for my C545 and finally understood what each stage actually does. Ordering felt straightforward once I matched the filter to the odors I was fighting instead of guessing by price.
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Marla K.Compared carbon and HEPA stages before buying
Buying a pack of filters at once suited my schedule better than ordering one at a time. Both bedrooms run all week, and having a spare ready meant I changed the first filter the day the indicator flagged it rather than waiting days for a delivery.
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Dre W.Bought a multi-pack for two busy rooms
I was skeptical that a replacement filter would change how mornings felt during pollen season. Running a fresh True HEPA in the bedroom made a visible difference on surfaces and left me feeling like the air held up better through the night.
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Priya N.Shopped for allergy-season relief at home
Filter cost was the part I wanted to understand before committing. I checked a few sellers, noted how often each stage realistically needs replacing, and settled on a schedule I could budget for without guessing at the next purchase.
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Tom B.Compared filter costs across several retailers
With two dogs and a kitchen that stays busy, odor was the reason I shopped at all. The heavier carbon layer addressed the smells I noticed when walking in, and the swap itself took less than a minute once I found the filter door.
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Elena R.Chose a carbon-heavy option for pets and cooking
Before you order

Common questions about Winix C545 filters

Start with the problem you notice. If rooms smell after cooking or pets, favor a heavier activated carbon layer. If pollen, dust or dander concern you, prioritize True HEPA, which captures 99.97% of particles at 0.3 microns. Most C545 replacements carry both stages.
Follow the filter indicator rather than a fixed calendar, since room conditions change the pace. Homes with pets or open windows load a filter faster than a quiet apartment, and rinsing a washable mesh between changes helps the main filter last. When airflow drops or odors return, it is due.
PlasmaWave is a low-voltage ionization process that reduces air pollutants with much lower ozone than conventional ion generators. It supports the unit but does not replace physical media: the pre-filter, carbon and True HEPA stages still capture particles and odors, so filter changes still apply.
Compatible replacements are built to fit C545 series units and are a common way to manage filter cost. Check that the listing names your model series and states both a HEPA and carbon stage if you want odor control. If airflow weakens after the swap or the frame sits loose, the fit is wrong.
Usually, because the price per filter drops as the pack grows, and a four-pack can cover roughly a year of typical use. With a spare on hand you change filters when the indicator warns instead of running degraded while waiting on a delivery. Check that the media covers both stages.
It depends on which stage wears first. Carbon loads with odors while HEPA loads with particles, so heavy cooking or pets may call for carbon attention sooner. Pre-filter sheets and carbon-only swaps refresh odor control without discarding a HEPA filter that still captures well.

Keep reading for filter care and room advice