If you have a large open-plan living space and want it cleaned fast, the Blueair Blue Pure 211i Max is your best bet. With a CADR of 500 CFM — the highest on our list — it can cycle the air in a 1,550 sq ft room five times per hour. That's serious performance.

Blueair's HEPASilent technology combines electrostatic and mechanical filtration, which allows the fan to run at lower speeds while still achieving high filtration efficiency. The practical result: it moves more air more quietly than most competitors. On medium speed, we measured just 31 dB — impressively quiet for a unit this powerful.

The washable fabric pre-filter is a thoughtful touch. It catches large particles like pet hair and dust before they reach the main filter, extending filter life and saving you money. The pre-filter comes in multiple colors, which is a small but appreciated design detail.

Wi-Fi connectivity and the Blueair app work reliably, though the app itself is fairly basic compared to Molekule's offering. You get scheduling, speed control, and air quality readings — everything you need, nothing fancy.

The main downsides are its size and design. The 211i Max is a large, cylindrical unit that commands floor space. It's not unattractive, but it's not subtle either. If aesthetics are a priority, the Molekule Air Pro wins that battle. But if raw performance per dollar is your metric, the Blueair is hard to beat.