Blueair Blue Pure 311i+ Max

Specs only matter in context. Here's where the Blueair Blue Pure 311i+ Max genuinely fits — and the trade-offs worth knowing before you buy. If you're deciding between this model and similar options, focus on the fit cards below: they highlight the specific use cases where this purifier shines and the situations where it falls short.

• Good fitBest in large bedrooms, dens, and mid-size living roomsRated for 465 sq ft, with a smoke CADR of 339 CFM — enough for rooms up to about 510 sq ft by the two-thirds rule, which delivers the 4–5 air changes per hour allergists recommend.
• Good fitBedrooms and light sleepersAt 25 dB on its lowest setting, the Blueair Blue Pure 311i+ Max clears the 30 dB bedroom bar — roughly a whisper.
• Good fitOdors, pets, and smokeAn activated carbon stage traps the gases a particle filter can't — cooking smells, litter-box odor, VOCs, and wildfire smoke gases.
• Good fitSet-and-forget operationListed features include Blueair app, Auto mode, particle sensor, Alexa — handy for letting the purifier manage itself, though none of it replaces CADR headroom.

These alternatives share key traits with the Blueair Blue Pure 311i+ Max — same brand family or similar room coverage. Compare their scores, owner sentiment, and specs side by side to see which fits your specific needs better.

• Blueair$139.99Blueair Blue Pure 511i Max4.0/5★★★★★4.0 out of 5 stars(6)iAuto mode & sensorsQuiet operation237 sq ft“Absolutely! The Blueair Blue Pure 511i Max is a great choice.”
• Blueair$349.99Blueair Blue Pure 211i Max3.4/5★★★★★3.4 out of 5 stars(3)i674 sq ft“The Blueair 211i Max is fantastic.”
• WinixPrice variesWinix 5500-23.4/5★★★★★3.4 out of 5 stars(16)iAHAM VerifideEnergy StarCARBPet hair & danderAllergy relief360 sq ft“Winix 5500-2 works great.”
• Coway$229.99Coway Airmega AP-1512HH3.4/5★★★★★3.4 out of 5 stars(10)iAHAM VerifideEnergy StarCARBPet hair & danderValue for money361 sq ft“Coway AP-1512HH comes in at your max budget and does a great job.”

Quick answers to the questions shoppers most often ask before buying. If your question isn't covered here, check the full specifications below or compare against similar models above.

• What size room can the Blueair Blue Pure 311i+ Max handle?It's rated for rooms up to 465 sq ft. Cross-checking its 339 CFM smoke CADR against the two-thirds rule puts the honest ceiling at about 510 sq ft for allergy-level cleaning — beyond that it still helps, just with fewer air changes per hour.
• Is the Blueair Blue Pure 311i+ Max quiet enough for a bedroom?Yes — 25 dB on the lowest setting is under the 30 dB threshold most sleepers need, roughly a whisper. On high it reaches 50 dB, so size it to run on low or medium overnight.
• Can the Blueair Blue Pure 311i+ Max handle odors and smoke?Yes — its activated carbon stage traps odor and VOC gases while the HEPASilent + carbon (F3MAX+) filter handles the particles, which is the combination smoke and pet households need.

cadr dustiClean Air Delivery Rate for dust, in cubic feet per minute. Higher means faster dust removal.CADR guide →

370

cadr smokeiCADR — Clean Air Delivery Rate — measures how many cubic feet of air a purifier cleans per minute. Smoke particles are the hardest to capture, so smoke CADR is the honest number: aim for at least two-thirds of your room's square footage.CADR guide →

339

dimensions

12.5 x 12.5 x 21 in

weight lbs

8.0

cadr polleniClean Air Delivery Rate for pollen, in cubic feet per minute. Higher means faster relief during allergy season.CADR guide →

446

energy stariEnergy Star purifiers use roughly 40% less electricity than standard units — meaningful for something that runs 24/7.Certifications guide →

True

filter typeiThe particle filter grade. True HEPA captures 99.97% of particles at 0.3 microns; 'HEPA-type' has no standardized efficiency.Filter guide →

HEPASilent + carbon (F3MAX+)

model numberiThe manufacturer's exact model identifier — handy when comparing listings across retailers.

Blue Pure 311i+ Max

noise db maxiThe loudest fan setting, in decibels. 60 dB is normal conversation; above that you'll hear it across the room.Noise guide →

50

noise db miniThe quietest fan setting, in decibels. 20 dB is a whisper, 40 dB a quiet library — for bedrooms, look for under 30 dB here.Noise guide →

25

aham verifiediAHAM Verifide means CADR and room-size claims were verified in an independent lab, not self-reported.Certifications guide →

True

carb certifiediCARB certification means ozone emissions stay below California's strict safety threshold.Certifications guide →

True

smart featuresiExtras like air quality sensors, auto mode, app control, and sleep modes. Nice to have — they don't clean the air themselves.Smart features guide →

Blueair app, Auto mode, particle sensor, Alexa

warranty yearsiThe manufacturer's warranty period. Longer coverage signals confidence in the motor and build.

1

room coverage sqftiThe largest room, in square feet, this purifier can effectively clean — assuming standard 8-foot ceilings and 4–5 air changes per hour.Room size guide →

465

has activated carboniActivated carbon traps gases, odors, and VOCs that HEPA filters can't catch — essential for smoke, cooking smells, and pet odor.Filter guide →

True

filter lifespan monthsiHow long the manufacturer rates the filter to last under normal use. Running in smoky or dusty homes shortens it.Ownership cost guide →

9