Winix C545 filter
The Winix C545 takes the Winix GA Filter Set (C545): HEPA + 4 carbon (part GA-FILTER(AU)) as its filter; replace it every 12 months; Australian sellers list it from A$149.00 as of 1 August 2026. Fitment confirmed against the manufacturer's compatibility list.
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Your air purifier
Winix C545
Air purifier · C545 4-stage
Takes this filter
GA Filter Set (C545): HEPA + 4 carbon
GA-FILTER(AU)
The right filter for C545
Winix GA Filter Set (C545): HEPA + 4 carbon
- Replace every 12 months
- Fits inside the fridge
- Fits 1 model
The one-year filter set for the Winix C545: a True HEPA filter and four activated-carbon filters (one per quarter).
Reduces
- Fine dust, pollen and allergens
- Odours and gases (activated carbon)
- Pack
- HEPA filter and 4 carbon filters
- Lasts
- 12 months (carbon filters change every 3 months)
Every number this part goes by
- Retail name:
- GA-FILTER
Where to buy
Every seller we track for this part, cheapest first. Genuine is the manufacturer's own part; compatible is a third-party filter made to fit. Prices are re-checked daily where the seller publishes them. Last checked 1 August 2026.
How long it lasts
Replace every 12 months — the appliance's filter light tells you when.
After fitting: After fitting, hold the filter reset button until the filter light goes out.
Flow slows and taste drops off as the filter fills up. Changing on time is the whole point of the filter.
Not due yet?
This filter is due every 12 months. We'll email you when it's time — free, no spam.
Fitting it
A few minutes, no tools. Watch it done, then follow the steps.
- 1Switch the purifier off and unplug it.
- 2Pull the front panel off from the bottom edge and lift out the old filters in order: pre-filter, carbon filter, then HEPA filter.
- 3Take the new filters out of their plastic bags and fit them the same order and way round — HEPA at the back, carbon in front, pre-filter last.
- 4Refit the panel, plug in, and hold the filter reset button until the filter light goes out.
About your Winix C545
Winix air purifier, air purifier — C545 4-stage. Its filter is the GA Filter Set (C545): HEPA + 4 carbon, part GA-FILTER(AU), changed every 12 months.
Checking the model number: Look at the rating label on the back or the underside of the purifier: the model is the type code (AUS-1250AZPU, WXAP800W, 5500-2), not the marketing name. The filter pack code (GT, GI, GQ…) is printed on the old filter's frame.
Fits these models
Winix1 model
Common questions
- Which filter fits the Winix C545?
- The Winix C545 takes the Winix GA Filter Set (C545): HEPA + 4 carbon (part GA-FILTER(AU)). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my Winix C545?
- Every 12 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
- Where can I buy the GA-FILTER(AU) in Australia?
- We track 1 Australian seller for the GA-FILTER(AU); the lowest listed price when we last checked was A$149.00 at ausclimate. Prices are re-checked daily and dated on this page.
- How do I fit the GA-FILTER(AU) in a Winix C545?
- No tools, a few minutes: 4 steps, listed on this page with the replacement video where the maker has one.
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