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Our pick for a medium room

Blueair Blue Pure 311i Max

US model; particle and carbon filter included

$229.99US price, checked Oct 13, 2026

Light, quiet purifier for rooms up to 439 ft², with $44.99 filters every 6 to 9 months

Check price at Blueair Full review →

Portable air purifier

Austin Air HealthMate

HealthMate standard model

$715US price, checked Oct 13, 2026

Heavy steel purifier with lots of carbon, five-year filters and no published CADR

Check price at Austin Air Full review →

Criterion	Blueair Blue Pure 311i Max	Austin Air HealthMate
US price	$229.99Checked Oct 13, 2026 · Price details in the review	$715Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$499.93 Incomplete known subtotal. Not included: energy use.	$952 Incomplete known subtotal. Not included: energy use.
Choose if	A bedroom or office up to 439 ft² where you want low noise, app control and optional smoke or allergen filters.	You want a steel purifier with lots of carbon for odors and a filter change only every few years.
Main trade-off	Filters run about $60 to $90 a year, and the three-year warranty depends on registering within 60 days.	You pay $715 or more without a CADR, room size, noise or wattage figure to judge it by.
Key specifications	CADR (smoke, dust, pollen): 283, 314 and 365 cfm Room size: 439 ft² at 4.8 air changes an hour (one change every 12.5 minutes) Noise: 23 dB on low to 50 dB on high Power draw: 32 W; Blueair gives one figure, not a per-speed breakdown Filters: Particle + Carbon (standard), SmokeBlock or AllergenBlock, behind a washable fabric pre-filter Filter life and price: 6 to 9 months for the standard filter; $44.99 Particle + Carbon, $59.99 SmokeBlock, $64.99 AllergenBlock Controls: Speeds 1 to 3, Auto and Night; built-in air sensor; Wi-Fi app Size and weight: 19 × 12.5 × 12.5 (units not stated); 7.8 lb	CADR (smoke, dust, pollen): Not published by Austin Air Room size: Not published. Austin Air says only that it can clean large rooms Filter: One 4-stage filter: two pre-filters, 780+ cu in of carbon and zeolite (up to 15 lb), 60 sq ft of HEPA HEPA efficiency (maker's claim): 99.97% of particles down to 0.3 micron and 99% down to 0.1 micron Filter life and price: Up to 5 years in normal home use; $395 per replacement Fan: 3-speed centrifugal; motor rated for continuous use Power draw and noise: Not published. The manual gives only the outlet: 120 V AC, 60 Hz Wheels: The manual lists easy-roll wheels on standard-size models Size and weight: 14.5 × 14.5 × 23 in; 47 lb
Exact variant	US model; particle and carbon filter included	HealthMate standard model
Dimensions	19 × 12.5 × 12.5 (height × width × depth). Blueair doesn't give units, but the figures fit inches. It weighs 7.8 lb.	14.5 L × 14.5 W × 23 H in; 47 lb.
Installation	No installation. It has a 360° intake and a top air outlet, and Blueair says you can place it anywhere. Wi-Fi and the Blueair app add schedules, an on/off timer and filter tracking. The product page gives no wall clearance.	No installation. It plugs into a standard 120 V outlet. Austin Air says to set it on a flat, dry, stable surface at least four inches from any wall, with the vent facing away from the wall. It's meant to run 24/7.
Materials	A washable fabric pre-filter in four colors (Sand, Stockholm Fog, Moss, Limestone) covers the main filter. The standard Particle + Carbon filter pairs a particle layer with activated carbon that Blueair says traps light household odors. Blueair calls the system HEPASilent and says it combines electrostatic and mechanical filtration. SmokeBlock and AllergenBlock filters fit in place of the standard one.	Steel housing with a 360° perforated intake and a baked-on powder-coat finish. The filter has a large-particle pre-filter, a medium-particle pre-filter, over 780 cubic inches of activated carbon and zeolite (up to 15 lb), and 60 sq ft of HEPA media.
Warranty	One year against defects in material or workmanship. Register within 60 days, in your Blueair account or the app, and it extends to three years. Filters are covered for 30 days. Claims require that you've replaced filters on Blueair's schedule, with proof of purchase. Coverage is for the original owner only, and a unit exchanged during the extended term may be refurbished. If you bought it from another seller, you'll need proof of purchase. Blueair also says warranties aren't available from third-party resellers but doesn't define the term.	Five years on the unit against defects in material and workmanship, under normal home use. Coverage depends on returning the warranty registration. The filter has its own five-year pro-rated warranty, and Austin Air doesn't explain how the pro-rating works.
Returns	30 days from purchase for items bought directly from Blueair, with a prepaid return label. Filters and pre-filters taken out of their plastic wrap can't be returned. The $5 flat shipping charge and any other shipping charges aren't refunded. Processing takes 10 to 14 days. The refund then reaches your original payment method in 3 to 5 business days.	30-day money-back guarantee, no questions asked. Austin Air doesn't say who pays return shipping.
Unresolved questions	Whether it's listed in AHAM's Verifide directory, which couldn't be read Whether CARB has certified it; the part of CARB's list that loaded showed only a different Blueair model Power draw on low and which speed the 32 W figure refers to Noise at speeds 2 and 3 Whether HEPASilent's electrostatic stage uses an ionizer; Energy Star lists it as fan and filter Which sellers Blueair counts as third-party resellers for the warranty Wall clearance and other setup guidance from the manual	CADR for smoke, dust and pollen, and the room size it suits Power draw at each speed, so running cost is unknown Noise at each speed How the pro-rated filter warranty is calculated Why Austin Air's two stores list different prices Whether it's in AHAM's Verifide directory or on CARB's certified list

These comparisons use published specifications, not head-to-head tests. Prices and terms are dated. Unknown costs are not zero. Check the exact variant before you buy.