Winix C909 vs C545: Which Air Purifier Is Better? - RTINGS.com

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Main Differences

Display And Control

Filter Configuration

Particle Filtration Rate

Low-Noise Particle Filtration Rate

Products

Tested using Methodology v1.3.1

Updated Jul 15, 2026 03:59 PM

Tested using Methodology v1.3.1

Updated Jul 15, 2026 03:56 PM

Winix C909 Picture

Winix C545 Picture

HEPA Certified No

Activated Carbon Sheet

HEPA Certified No

Activated Carbon Sheet

Recommended in 1 article:
Quiet

Our Verdict

Winix C909

Winix C545

The Winix C909 is a better air purifier than the Winix C545. Both models offer Wi-Fi connectivity, automatic fan adjustment, and Winix's PlasmaWave ionization technology, but the C909 delivers substantially stronger air-cleaning performance and broader room coverage. It also maintains more of that performance at quieter fan speeds, making it the better choice for larger bedrooms and living spaces. The C545's main advantage is its smaller footprint, making it easier to fit into tighter spaces.

Variants

C909 (Black)

C545 (White)

Review

See Winix C909 Review

See Winix C545 Review

Check Price

Black

C909

White

C545

Black

C909

White

C545

Black

C909

White

C545

Black

C909

White

C545

Black

C909

White

C545

Main Differences for

Pets

Threshold

0.10

Pets

8.4

8.1

Particle Filtration Rate

8.4

8.0

Full Comparison

Pets

8.4

8.1

Particle Filtration Rate

8.4

8.0

Bedroom

8.3

8.3

Footprint

6.1

7.0

Design

Body

Weight

17.4 lbs (7.9 kg)

11.0 lbs (5.0 kg)

Power Cord Length

74.4" (189.1 cm)

74.6" (189.5 cm)

Wheels

No

No

Footprint

6.1

7.0

Compactness Photo

Compare High-Res

Winix C909 Compactness Photo

Compare High-Res

Winix C545 Compactness Photo

Width

11.5" (29.1 cm)

13.7" (34.9 cm)

Depth

16.6" (42.2 cm)

8.4" (21.3 cm)

Height

23.2" (59.0 cm)

20.5" (52.0 cm)

Display And Control

Main Controls

Compare High-Res

Winix C909 Main Controls

Compare High-Res

Winix C545 Main Controls

Alternative Controls

Compare High-Res

Winix C909 Alternative Controls

Compare High-Res

Winix C545 Alternative Controls

Filter Change Indicator

Yes

Yes

Air Quality Sensor Auto Mode

Yes

Yes

Remote Control

No

No

App

Yes

Yes

Display On/Off

Dimmable only

Dimmable only

Timer Function

Yes

Yes

Number Of Fan Speeds

5

5

Filter Configuration

Filter Configuration Photo

Compare High-Res

Winix C909 Filter Configuration Photo

Compare High-Res

Winix C545 Filter Configuration Photo

Filter Localization Photo

Compare High-Res

Winix C909 Filter Localization Photo

Compare High-Res

Winix C545 Filter Localization Photo

HEPA Certified

No

No

Filtration Layers

3 Stage

3 Stage

Activated Carbon

Sheet

Sheet

Performance

Particle Filtration Rate

8.4

8.0

Purification Graph

Preview Graph

Winix C909 Purification Graph

Preview Graph

Winix C545 Purification Graph

Measured PM1.0 CADR

500 m³/hr (294 CFM)

426 m³/hr (251 CFM)

Recommended Room Size @ Max Fan Speed

42.7 m² (459 ft²)

36.4 m² (391 ft²)

Low-Noise Particle Filtration Rate

8.4

7.6

Purification Graph @ ≤ 45dBA

Preview Graph

Winix C909 Purification Graph @ ≤ 45dBA

Preview Graph

Winix C545 Purification Graph @ ≤ 45dBA

Measured PM1.0 CADR

337 m³/hr (198 CFM)

208 m³/hr (122 CFM)

Fan Speed Used

Speed 2

Speed 3

Recommended Room Size

28.8 m² (310 ft²)

17.7 m² (191 ft²)

Noise

8.3

8.5

Noise Video

Noise @ Lowest Fan Speed

33.1dBA

32.5dBA

Noise @ Highest Fan Speed

53.9dBA

59.7dBA

Check Price

Black

C909

White

C545

Black

C909

White

C545

Black

C909

White

C545

Black

C909

White

C545

Black

C909

White

C545

Winix C909

Winix C545

Comments

Comparison

• Posted 1 month ago

Winix C909 vs Winix C545: Main Discussion

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