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Our pick if it has to go on the wall

Rabbit Air MinusA2

US MinusA2

$599.95US price, checked Oct 13, 2026

Slim wall-mount purifier for rooms near 280 ft², with $95 yearly filters

Check price at Rabbit Air Full review →

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 →

Criterion	Rabbit Air MinusA2	Blueair Blue Pure 311i Max
US price	$599.95Checked Oct 13, 2026 · Price details in the review	$229.99Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$884.95 Incomplete known subtotal. Not included: energy use.	$499.93 Incomplete known subtotal. Not included: energy use.
Choose if	You want a purifier on the wall, not the floor, in a bedroom or office up to about 280 ft².	A bedroom or office up to 439 ft² where you want low noise, app control and optional smoke or allergen filters.
Main trade-off	$599.95 buys a smoke CADR of 180, and Rabbit Air doesn't say who tested that figure.	Filters run about $60 to $90 a year, and the three-year warranty depends on registering within 60 days.
Key specifications	CADR (smoke, dust, pollen): 180, 193 and 200; Rabbit Air doesn't name the test standard Room size: Rabbit Air says 408 ft² at 4 air changes an hour or 815 ft² at 2 (8 ft ceiling, top speed). Those match its 218 CFM airflow. On the 180 smoke CADR, 4.8 air changes an hour fits about 280 ft². Noise: 25.6 to 51.3 dBA across five speeds; no per-speed breakdown Power draw: 6 to 61 W (120 V, 0.85 A max); no per-speed or standby figures Filters: Washable pre-filter, medium, BioGS HEPA, one customized filter and activated carbon, plus an ion generator you can switch off Filter life and price: $95 kit (medium, HEPA, customized and carbon) every 12 months at 24/7, or up to 2 years at 12 hours a day; $14.95 spare pre-filter Size and weight: 20 × 21.4 × 7 in; 19.4 lb; wall-mount kit included Controls: Auto mode with particle and odor sensors, pollen mode and a light sensor; remote on the SPA-780A, Wi-Fi app control and no remote on the $619.95 SPA-780N	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
Exact variant	US MinusA2	US model; particle and carbon filter included
Dimensions	20 × 21.4 × 7 in (height × width × depth). Another spec section on the same page gives the height as 20.25 in. It weighs 19.4 lb, and the power cord is 9.33 ft.	19 × 12.5 × 12.5 (height × width × depth). Blueair doesn't give units, but the figures fit inches. It weighs 7.8 lb.
Installation	None needed to stand it on the floor. It plugs into a 120 V outlet. A wall-mount kit comes in the box, and the manual says to drive the hanger screws into studs. On a wall it needs 2 ft of space below the ceiling and 8 in on each side. On the floor it needs 2 ft clear at the air outlet and 8 in at the intakes on each side.	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.
Materials	Six stages: a washable pre-filter, a medium filter, a BioGS HEPA filter, one customized filter, an activated carbon filter and a negative ion generator. You pick the customized filter: Germ Defense, Toxin Absorber, Pet Allergy or Odor Remover. Rabbit Air says the HEPA media is treated to keep bacteria and mold from growing on the filter itself. The ion generator can be switched off.	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.
Warranty	Rabbit Air covers defects in materials and workmanship for 5 years from the original retail purchase. Its registration page says registering gets you the 5-year warranty and free round-trip shipping to its service center in the contiguous US. The manual asks you to register within 90 days of purchase. Filters, filter frames and cases, wall-mount brackets and cosmetic damage aren't covered. Rabbit Air may ask for proof of purchase.	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.
Returns	90 days from purchase, with a prepaid return label, for orders bought on RabbitAir.com and shipped in the contiguous 48 states. It has to come back like new, in the original packaging with the remote and manual. Items that aren't like new may carry a restocking fee. Replacement filters can't be returned once unwrapped.	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.
Unresolved questions	Whether AHAM has verified its CADR figures Whether CARB certified it; the readable part of CARB's list held only recent entries Which test standard and lab produced the CADR figures Power draw and noise at each of the five speeds, and standby power Average power on auto, so the yearly electricity cost What warranty cover applies if you don't register	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

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.