The Blueair Blue Pure 311i+ Max is a high-performance HEPA air purifier designed for rooms up to 1,262 square feet, capable of cleaning up to 2,520 square feet in just 60 minutes. It removes at least 99.97% of airborne particles including dust, pollen, smoke, and allergens using a 3-stage filtration system with HEPASilent technology.

The unit features a 360-degree air intake design for flexible placement anywhere in the room. It operates whisper-quiet thanks to a built-in noise shield that reduces sound levels while maintaining powerful purification. The simple one-touch control on top makes operation effortless, while the Blueair app provides WiFi connectivity and RealTrack filter lifetime tracking based on actual usage, fan speed, and pollution levels.

Key specifications include dimensions of 12.5" x 6.8" x 21", a weight of 7.9 pounds, a 6-foot power cord, and Bluetooth connectivity. The unit is Energy Star certified and features washable pre-filters in customizable colors. Filter lifetime extends up to 9 months depending on usage. CADR ratings are 446 for pollen, 370 for dust, and 339 for smoke. The Costco package includes an extra replacement filter.