Winix · Everyday pick
Winix C545
A four-stage Winix with a washable pre-filter, a separate carbon filter for smells and a True HEPA filter, rated for rooms of about 33 m².
- Washable pre-filter
- Air-quality sensor and auto mode
$209.99at winixamerica.com · Nov 2026
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- smoke CADR: clean air it moves each minute
- 232 cfm
- room size it suits, every day
- 33 m²
- 360 ft²
- room size on smoggy days
- 22 m²
- 232 ft²
Winix C545 at a glance
- Smoke CADR
- 232 cfm (AHAM)
- Filter
- Washable pre-filter, activated carbon, True HEPA
- Replacement filter
- Winix Filter S (1712-0096-00)
- Ioniser
- PlasmaWave, which you can switch off
- Sensor
- Air-quality sensor with auto mode
Which rooms it suits
Everyday: AHAM's room size. Smog: AHAM's advice for smoke, a CADR at least equal to the floor area in ft².
| Room | Everyday | Smog days |
|---|---|---|
| Bedroom · 15 m² (161 ft²) | ||
| Living room · 30 m² (323 ft²) | ||
| Large room · 50 m² (538 ft²) |
From the maker
Our take
The C545 is a straightforward room purifier with good bones: a pre-filter you can rinse, a carbon filter for cooking and smoke smells, and a True HEPA filter behind them. Its smoke CADR of 232 cfm is within a whisker of the Coway Mighty's, so it suits rooms of about 33 m².
It also has PlasmaWave, Winix's ioniser. The filters do the cleaning, so we'd switch it off.
Switch PlasmaWave off: it's an ioniser, and the filters do the cleaning.
Its filter: Winix C545 Replacement Filter S · $49.99 at winixamerica.com
Good for
- Bedrooms and living rooms up to about 33 m²
- Kitchens and smokers' homes: it has a separate carbon filter
Skip it if
- You'd rather have no ioniser at all, even one you can switch off
How it compares
Every air purifier in the shop.
| Product | Best for | Smoke CADR | Room size | Price |
|---|---|---|---|---|
| Levoit Core 300S | Smart bedroom | 141 cfm | 20 m² | $149.99 |
| Levoit Core 300 | Budget bedroom | 143 cfm | 21 m² | $89.99 |
| Levoit Vital 100S | Pet-friendly bedroom | 143 cfm | 21 m² | $119.99 |
| Coway Airmega 150 | Small & quiet | 153 cfm | 22 m² | $189.99 |
| Levoit Core 400S | Shows PM2.5 | 231 cfm | 33 m² | $189.99 |
| Winix C545 (this one) | Everyday pick | 232 cfm | 33 m² | $209.99 |
| Coway Airmega AP-1512HH Mighty | Best overall | 233 cfm | 34 m² | $239.99 |
| Coway Airmega AP-1512HHS (Mighty with Wi-Fi) | Smart Mighty | 233 cfm | 34 m² | $299.99 |
| Coway Airmega 200M | Mighty's twin | 233 cfm | 34 m² | $229.99 |
| Levoit Vital 200S | Pet homes | 250 cfm | 36 m² | $169.99 |
| Honeywell HPA300 | No-frills power | 300 cfm | 43 m² | $269.95 |
| Coway Airmega 400 | Big rooms | 376 cfm | 54 m² | $649.00 |
| Levoit Core 600S | Large rooms | 391 cfm | 56 m² | $299.99 |
| Blueair Blue Pure 211i Max | Most clean air | 435 cfm | 63 m² | $349.99 |
| Filtrete MPR 1900 MERV 13 filters for a DIY box-fan purifier (4-pack) | Budget build | — | — | $87.99 |
Its filter, and related models
Winix Filter S (1712-0096-00)C545 · $49.99
In our buying guides
Questions about the C545
- What size room does the Winix C545 cover?
- About 360 ft² (33 m²). That's AHAM's room size for its smoke CADR of 232 cfm: the floor area, with an 8 ft ceiling, whose air it cleans about every 12.5 minutes.
- Is the Winix C545 enough for smog?
- For smoke and heavy smog AHAM suggests a smoke CADR at least equal to the floor area in square feet. By that measure the Winix C545 keeps up with a room of about 232 ft² (22 m²). Keep the windows shut and run it on high while the AQI is bad.
- What filter does the C545 use?
- Winix Filter S (1712-0096-00), a True HEPA filter with carbon pre-filters. Many cheaper copies are sold; the Winix part fits for sure.
How we judge. We haven't tested the C545 in a lab of our own. The figures come from independent ratings (AHAM, Energy Star, NIOSH, the ASPCA) or the maker, and the verdict is ours, from those figures. No brand pays to be listed. Last checked Nov 7, 2026.
Winix C545
$209.99 list price