Winix AT40 All-in-One 4-Stage True HEPA Wi-Fi Large Room Air Purifier

The Winix AT40 All-in-One 4-Stage True HEPA Wi-Fi Large Room Air Purifier delivers powerful 360 degree air cleaning, and includes 2 All-in-One True HEPA filter sets for up to 2 years of filtration. 

When allergies, asthma, or smoke are your concern, look first at the filter stack. The fine-mesh pre-filter catches hair and lint. The True HEPA layer captures fine particles, while activated carbon reduces gases and household odors from cooking, pets, and smoke.

Key Features and Benefits of the Winix AT40 All-in-One 4-Stage True HEPA Wi-Fi Large Room Air Purifier

• True HEPA: The 99.99 percent True HEPA filter captures ultrafine airborne particles, including pollen, dust, smoke, and pet dander.
• AHAM Verified Coverage: This model is AHAM verified to cover up to 410 square feet at 4.8 clean air changes.
• Other Cleaning Coverage: The purifier cleans up to 1,968 square feet in 1 hour, 984 square feet in 30 minutes, 656 square feet in 20 minutes, or 492 square feet in 15 minutes.
• CADR Performance: Clean Air Delivery Ratings of 259 for dust, 244 for pollen, and 265 for smoke help you compare cleaning performance across common airborne concerns.
• Carbon Stage: The activated carbon filter lasts 12 months and reduces VOCs and household odors from cooking, pets, and smoke.
• PlasmaWave Technology: Plasma ionization treats airborne bacteria and viruses with negligible ozone emission, adding another treatment stage for your indoor air.
• Smart Controls: Use the electronic panel, or the Winix Smart App over Wi-Fi, Alexa, or Google Home to control and monitor the air purifier, check air quality, and track filter life.  
• Auto Response: Dual smart sensors monitor air quality and light, so the purifier can adjust fan speed and enter Sleep Mode when your bedroom gets dark.
• Quiet Low Speed: The lowest setting measures 22 dB, ideal for bedrooms and everyday use.
• Air Quality Display: The digital readout and 3-color LED show Good in blue, Fair in amber, or Poor in red. Adjustable brightness helps you suit the display to a dim room.
• Filter Tracking: Tap Filter Reset to view remaining filter life and get alerts when it's time to replace the filter for optimal performance.

Where to Place the AT40 for a 410-Square-Foot Rating

At 19 inches high and 10.24 inches wide/deep, and 10.2 pounds, this air purifier fits on the floor or a wide shelf. You can move it between a bedroom and home office during the day. Its portable format lets you focus on cleaning where you spend the most time.

Sylvane's Expert Take

Choose this air purifier when you want a portable tower for recurring air concerns in a bedroom, living space, or home office. It is especially suited for residential rooms where cooking, pets, or smoke create ongoing indoor-air concerns.

The standout feature is the Wi-Fi-connected monitoring, which fits on-the-go households where physical monitoring isn't ideal.