Blueair Blue Pure 311i Max vs Dyson Purifier Big+Quiet Formaldehyde BP03

Blueair Blue Pure 311i Max, for value and measurable particle performance: AHAM Verifide 283 CFM smoke CADR, PM1, PM2.5 and PM10 sensing and a 32 W draw. Dyson Purifier Big+Quiet Formaldehyde BP03 is the better machine only if you need formaldehyde, VOC and CO2 detection or a 5 year filter.

Only Dyson Purifier Big+Quiet Formaldehyde BP03, which reads PM2.5, VOCs, CO2 and formaldehyde and shows them on an on-board LCD. Blueair Blue Pure 311i Max is a particle-only machine, but it splits its readings into PM1, PM2.5 and PM10 rather than reporting a single figure.

Dyson Purifier Big+Quiet Formaldehyde BP03 rates its sealed H13 filter at up to 5 years and its catalytic formaldehyde stage never needs replacing, but there is no washable pre-filter. Blueair Blue Pure 311i Max has a washable fabric pre-filter and a combined particle and carbon filter rated at 9 months.

Blueair Blue Pure 311i Max is AHAM Verifide at 283 CFM smoke CADR for 439 sq ft. Dyson publishes no CADR for the BP03 and it is not AHAM certified, quoting air projection over 32 feet instead, which is not directly comparable.

Blueair Blue Pure 311i Max is small, light at 3.5 kg and draws 32 W at top speed. Dyson Purifier Big+Quiet Formaldehyde BP03 weighs over 26 lb, stands 830 mm tall and is built to project air across a big room, but it adds ten fan speeds, an LCD and a magnetic remote that the Blueair does not have.

Homes with new furniture, flooring or paint off-gassing formaldehyde, stuffy rooms where CO2 builds up, or anyone who wants sealed H13 filtration with a filter measured in years rather than months. It carries a 2 year warranty, where Blueair Blue Pure 311i Max offers 1 year at a much lower price.