The Winix 5510 and 5520 are functionally identical air purifiers that differ only in their front grill design. Both models are well-regarded for their strong performance and smart features, making them a solid choice for medium to large rooms.
For a quick overview, the following table compares their key specifications.
| Feature | Winix 5510 & 5520 |
|---|---|
| Official Room Size | 392 sq. ft. |
| CADR (Dust/Pollen/Smoke) | 252 / 247 / 253 CFM |
| Filtration Stages | 4-stage: Pre-filter, AOC™ Carbon, True HEPA, PlasmaWave® |
| Smart Features | Wi-Fi, Winix Smart App, Auto Mode, Air Quality Sensor & Indicator |
| Noise Level | Sleep Mode: ~35.2 dBA / Max Speed: ~65.7 dBA |
| Dimensions (HxWxD) | 22.2″ – 22.7″ x 13.6″ x 8.3″ |
| Weight | 13.3 lbs |
| Warranty | 2-year limited warranty |
A Closer Look at Features and Performance
The Winix 5510/5520 uses a comprehensive 4-stage filtration system that delivers excellent real-world performance.
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Advanced 4-Stage Filtration: The system includes a washable pre-filter for large particles like dust and pet hair. The AOC™ Carbon Filter uses pelleted activated carbon to reduce VOCs and household odors from cooking, pets, and smoke. The True HEPA Filter captures 99.99% of airborne allergens as small as 0.01 microns, including pollen, dust, smoke, and pet dander. The final stage is PlasmaWave® Technology, which can be turned on or off, and works to break down pollutants at a molecular level.
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Proven Cleaning Power: In performance tests, the Winix 5510 reduced PM2.5 particulate matter by 96% in 60 minutes in a 320 sq. ft. room. Another independent test showed it could clear a test room of ultra-fine particles in just 24 minutes, a performance on par with other highly-regarded models.
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Smart Sensors and Auto Mode: A built-in air quality sensor measures pollutants and automatically adjusts the fan speed in real-time. An LED indicator on the unit changes color (blue, amber, red) to provide a clear, real-time view of your air quality.
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Smart App Control: You can control and monitor the purifier remotely using the Winix Smart App on your smartphone. The app allows you to check filter life, adjust settings, and monitor air quality.
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Quiet Operation: On its lower settings and in Sleep Mode, the unit operates very quietly, which is ideal for bedrooms.
How to Choose Between 5510 and 5520
Your decision is simple, as the only difference is aesthetic: the 5510 has a vertically striped front panel, while the 5520 has a square waffle design. Beyond the grill pattern, they are the same machine with identical performance, features, and price. Choose based on which style you prefer.