Blueair Blue Pure 211i Max vs Levoit Core 400S-P

Levoit Core 400S-P wins for most buyers on price, warranty and smart home integration, including Home Assistant support. Blueair Blue Pure 211i Max is the stronger machine for large spaces, with an AHAM Verifide 435 CFM smoke CADR against 231 CFM and separate PM1, PM2.5 and PM10 readings.

Both figures are AHAM Verifide. Blueair Blue Pure 211i Max is rated at 435 CFM smoke CADR for 674 sq ft, and Levoit Core 400S-P at 231 CFM for 358 sq ft. That makes the Blueair roughly a large-open-plan machine and the Levoit a big-living-room machine.

Levoit Core 400S-P, through Home Assistant's VeSync integration, which exposes fan control, air quality and filter life. Blueair Blue Pure 211i Max has no official Home Assistant integration and works with Alexa and Google Home only. Neither supports Apple HomeKit or Matter.

Blueair Blue Pure 211i Max puts a washable fabric pre-filter in front of a combined particle and carbon filter rated at 9 months, using HEPASilent electrostatic and mechanical filtration. Levoit Core 400S-P uses a sealed 3-in-1 H13 True HEPA cartridge rated at about 8 months, where the pre-filter layer is vacuumed rather than washed.

Levoit Core 400S-P drops to about 24 dB in sleep mode with a dimmed display and peaks at 52 dB. Blueair Blue Pure 211i Max has a Night mode and lights that can be switched off completely, and it reaches 53 dB at the top of its four speeds while moving considerably more air.

Owners of large or open-plan spaces, and anyone who wants particle data broken down into PM1, PM2.5 and PM10 rather than a single number. It draws 46 W, is Energy Star certified and has a washable pre-filter, but the warranty is 1 year against the 2 years on Levoit Core 400S-P.