Blueair Blue Pure 311i Max vs Winix 5520

Winix 5520 wins on price, filtration depth and warranty, with True HEPA behind a washable pre-filter, an optional PlasmaWave stage and 2 years of coverage. Blueair Blue Pure 311i Max leads on certified airflow (283 CFM for 439 sq ft), on PM1, PM2.5 and PM10 sensing, and on a 7.8 W power draw.

Close. Both are AHAM Verifide: Blueair Blue Pure 311i Max at 283 CFM smoke CADR for 439 sq ft, Winix 5520 at 253 CFM for 392 sq ft. In practice both suit the same bedrooms and mid-sized living rooms, so warranty, filters and running cost decide the choice.

PlasmaWave is the ionization stage in Winix 5520, switchable from the control panel, and testing bodies generally recommend leaving ionizers off since the mechanical filtration works fully without it. Blueair Blue Pure 311i Max has no ionizer; its HEPASilent design charges particles electrostatically before a mechanical filter catches them.

Blueair Blue Pure 311i Max, at 7.8 W with Energy Star certification, against 50 W for Winix 5520, which is not Energy Star certified. Both use washable pre-filters, though only the Blueair publishes a main filter interval, rated at 9 months.

Blueair Blue Pure 311i Max, with PM1, PM2.5 and PM10 on its own display and in the app. Winix 5520 has no screen and reports PM2.5 through an LED air quality indicator and the Winix Smart app, plus a light sensor that switches the unit to sleep mode when the room darkens.

Buyers who want a proven True HEPA purifier with a washable pre-filter and a 2 year warranty at a mid-range price, and who are happy with Alexa as the voice assistant. If you would rather have three-size particle data, Google Home support and a tiny power draw, Blueair Blue Pure 311i Max is the alternative.