Winix C909 4-Stage Smart Air Purifier with Wi-Fi, True HEPA Filters and 2-Year Filter Supply

Improve everyday indoor air cleaning with the Winix C909 Smart Air Purifier. Its four-stage system combines a washable fine-mesh pre-filter, activated carbon filtration, a True HEPA filter, and PlasmaWave air-cleaning technology.

Dual smart sensors monitor surrounding air quality and allow Auto Mode to adjust the fan speed automatically. Wi-Fi connectivity adds remote controls, air-quality monitoring, and filter-life tracking through the Winix Smart App. The included filter bundle provides up to 24 months of filtration under normal usage conditions.

Key Features

• Four-stage air-cleaning system

• True HEPA filtration captures 99.99% of tested airborne particles as small as 0.003 microns

• Washable fine-mesh pre-filter captures larger particles

• Activated carbon filters help reduce household odors and VOCs

• PlasmaWave technology may help reduce airborne impurities

• Dual smart sensors monitor air quality

• Auto Mode adjusts fan speed based on detected conditions

• Wi-Fi control through the Winix Smart App

• Real-time LED air-quality indicator

• Automatic light-sensing Sleep Mode

• Quiet operation as low as 25 dB

• Filter-replacement indicator

• Includes a 2-year filter supply

• AHAM verified for a 500 sq. ft. room

• Energy Star and UL certified

Four-Stage Filtration

Stage 1: Washable Pre-Filter

The reusable fine-mesh pre-filter captures larger airborne particles before they reach the primary filters. Regular cleaning helps maintain airflow and extend filter life.

Stage 2: Activated Carbon Filter

The carbon filter helps reduce household odors and VOCs associated with cooking, pets, and smoke while capturing additional airborne particles.

Stage 3: True HEPA Filter

The True HEPA filter captures 99.99% of tested airborne allergens and particles as small as 0.003 microns, including dust, pollen, smoke particles, and pet dander.

The stated efficiency is based on independent laboratory testing using inanimate particles as small as 0.003 microns.

Stage 4: PlasmaWave Technology

PlasmaWave technology may help reduce the presence of airborne impurities and contaminants as air passes through the purifier.

Room Coverage

• AHAM-verified room size: 500 sq. ft.

• Up to 2,420 sq. ft.: 1 air change per hour

• Up to 1,210 sq. ft.: 2 air changes per hour

• Up to 807 sq. ft.: 3 air changes per hour

• Up to 605 sq. ft.: 4 air changes per hour

Actual performance varies with room layout, ceiling height, airflow, filter condition, pollutant levels, and operating speed.

Smart Controls

• Connects to compatible Wi-Fi networks

• Remote operation through the Winix Smart App

• Monitor indoor air-quality conditions

• Change purifier settings remotely

• Track remaining filter life

• View real-time air-quality information

• Auto Mode responds to sensor readings

• Sleep Mode activates when the room becomes dark and returns to Auto Mode when light is detected

Specifications

• Brand: Winix

• Model: C909

• Product type: Smart room air purifier

• Filtration stages: 4

• Recommended room size: 500 sq. ft.

• Maximum listed coverage: 2,420 sq. ft. with 1 air change per hour

• Connectivity: Wi-Fi

• Mobile control: Winix Smart App

• Sensors: Dual smart sensors

• Pre-filter: Washable fine mesh

• Primary filter: True HEPA

• Odor filter: Activated carbon

• Additional technology: PlasmaWave

• Voltage: 120 V

• Frequency: 60 Hz

• Maximum listed power: 95 W

• Sleep Mode power: 7 W

• Low-speed power: 10 W

• Medium-speed power: 19 W

• High-speed power: 28 W

• Turbo-speed power: 90 W

• Sleep Mode noise: 25 dB

• Low-speed noise: 30 dB

• Medium-speed noise: 38 dB

• High-speed noise: 41 dB

• Turbo-speed noise: 52 dB

• Materials: ABS and EPS plastic

• Dimensions: 16.5" L × 11.4" W × 23.2" H

• Weight: 17.2 lb.

• Country of origin: Thailand

• Certifications: AHAM verified, Energy Star certified, and UL certified

• Warranty: 2-year manufacturer warranty

What’s Included

• 1 Winix C909 smart air purifier

• 2 True HEPA filters

• 8 activated carbon filters

• Washable fine-mesh pre-filter

• User documentation

The included filters provide up to 24 months of use under normal operating conditions. Actual replacement frequency depends on usage and indoor air conditions.

Ideal For

• Bedrooms and living rooms

• Open-plan home spaces

• Pet households

• Homes affected by cooking odors

• Dust and pollen management

• Smoke-particle filtration

• App-connected smart homes

• Users who prefer automatic air-quality monitoring

• Quiet nighttime operation

Why It Stands Out

The Winix C909 combines large-room filtration, automatic sensor-based operation, and app connectivity with a substantial replacement-filter bundle. Its multiple fan speeds support anything from quiet bedroom use to faster air circulation, while the washable pre-filter and filter-life indicator simplify maintenance.

Care and Maintenance

• Clean the washable pre-filter regularly

• Replace the True HEPA and carbon filters when indicated

• Do not wash the True HEPA or activated carbon filters

• Keep air inlets and outlets unobstructed

• Follow the manufacturer’s cleaning and filter-installation instructions

• Actual filter life varies with operating time and air quality

Frequently Asked Questions

What room size is the C909 designed for?

It is AHAM verified for rooms up to 500 sq. ft. It can circulate air in larger spaces at fewer air changes per hour.

How many filtration stages does it have?

It uses four stages: a washable pre-filter, activated carbon filter, True HEPA filter, and PlasmaWave technology.

What filters are included?

The package includes two True HEPA filters and eight activated carbon filters, providing up to 24 months of normal use.

Can it be controlled from a phone?

Yes. Wi-Fi connectivity allows compatible controls and monitoring through the Winix Smart App.

Does it automatically adjust the fan speed?

Yes. In Auto Mode, the dual smart sensors monitor air conditions and adjust the fan speed.

How loud is it?

The listed noise range is approximately 25 dB in Sleep Mode to 52 dB in Turbo Mode.

Does Sleep Mode activate automatically?

Yes. A light sensor activates Sleep Mode when the room becomes dark and returns the purifier to Auto Mode when light is detected.

What warranty is included?

The purifier includes a 2-year manufacturer warranty. For product support, contact Winix America at 1-877-699-4649 or 1-847-551-9900.