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Portable air purifier

Levoit Core 300-P

US Core 300-P

$104.99US price, checked Oct 13, 2026

Small-room air purifier for spaces up to 222 ft², with a $29.99 filter

Check price at Levoit 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	Levoit Core 300-P	Blueair Blue Pure 311i Max
US price	$104.99Checked Oct 13, 2026 · Price details in the review	$229.99Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$239.96 Incomplete known subtotal. Not included: energy use.	$499.93 Incomplete known subtotal. Not included: energy use.
Choose if	A bedroom or home office up to 222 ft² where floor space is tight.	A bedroom or office up to 439 ft² where you want low noise, app control and optional smoke or allergen filters.
Main trade-off	Levoit publishes one CADR and one power figure, and no independent listing for it could be confirmed.	Filters run about $60 to $90 a year, and the three-year warranty depends on registering within 60 days.
Key specifications	CADR: 143 CFM; Levoit gives one figure, not separate smoke, dust and pollen ratings Room size: 222 ft² at 4.8 air changes an hour; 1,066 ft² at 1 Noise: 24 to 54.5 dB; 26 dB or less in sleep mode, per the filter pages; no per-speed figures Power draw: 56 W rated at 120 V; no high, low or standby figures Filters: One 3-stage filter: pre-filter, main filter and activated carbon Filter life and price: 6 to 8 months; $29.99 standard, $35.99 Pet Allergy or Toxin Absorber, $39.99 Smoke Remover Controls: Sleep mode, a 2 to 8 hour timer and a check-filter indicator; the feature list has no app or air-quality sensor Size and weight: 8.7 × 8.7 × 14.2 in; 7.9 lb	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 Core 300-P	US model; particle and carbon filter included
Dimensions	8.7 × 8.7 × 14.2 in, or 22 × 22 × 36 cm. It weighs 7.9 lb (3.6 kg).	19 × 12.5 × 12.5 (height × width × depth). Blueair doesn't give units, but the figures fit inches. It weighs 7.8 lb.
Installation	No installation. It's a freestanding unit that plugs into a 120 V, 60 Hz outlet. Levoit lists an operating range of 14 to 104°F and humidity below 85%. The product pages give no clearance advice, and the linked manual PDF has no readable text.	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	It has three stages: a pre-filter for hair, dust and large particles, a main filter, and a high-density activated carbon filter for gases and odors. All three come as one replaceable filter. Levoit says the main filter removes 99.97% of ultrafine particles down to 0.3 μm. Its HEPA claim covers sleep mode only and cites an unnamed independent lab test to IEST RP C001.7. Levoit doesn't name the main filter's media. The product pages call it ozone free.	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	2 years from the original purchase date, covering defects in materials and workmanship. In California the period starts on delivery or pickup. Registration isn't required, and the warranty doesn't transfer to a later owner. Filters count as wear items and aren't covered, and neither is commercial or rental use. Units from unauthorized sellers don't qualify. Claims go through support.levoit.com and need proof of purchase with the invoice or order ID. The warrantor, Arovast, chooses whether to refund, repair or replace it.	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	Levoit offers a 30-day money-back guarantee on direct purchases, counted from delivery. The unit must go back in its original condition and packaging, with all accessories and a copy of the invoice. Excessively worn, used or altered items are refused. Levoit sends a prepaid label and an RMA number once it approves the return, and you have 15 days to ship it. Refunds go to the original payment method within 30 days of receipt. The policy doesn't mention filters or restocking fees.	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's Verifide directory lists it, and with which smoke, dust and pollen CADR Whether CARB certified it; the readable part of CARB's list didn't reach it Which pollutant the 143 CFM figure refers to Power draw at each fan speed and in standby Noise at each fan speed Clearance and pre-filter care advice, because the manual PDF has no readable text How the Pet Allergy filter differs from the standard filter Which color ships from the $99.99 main listing Whether opened filters can be returned	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.