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Portable air purifier

Alen BreatheSmart 45i

US BreatheSmart 45i

$449US price, checked Oct 13, 2026

Slim, quiet HEPA purifier with a guarantee tied to Alen filters

Check price at Alen Full review →

Portable air purifier

Levoit Vital 200S-P

Vital 200S-P, Black / LAP-V201S-WUS

$199.99US price, checked Oct 13, 2026

App-controlled purifier for rooms up to 388 ft², with a $49.99 filter

Check price at Levoit Full review →

Criterion	Alen BreatheSmart 45i	Levoit Vital 200S-P
US price	$449Checked Oct 13, 2026 · Price details in the review	$199.99Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$725 Incomplete known subtotal. Not included: energy use.	$349.96 Incomplete known subtotal. Not included: energy use.
Choose if	You want a quiet, slim HEPA purifier for one large room and don't mind buying Alen filters every year.	A bedroom or living room up to about 390 ft² where you want app schedules and a pet filter option.
Main trade-off	Filters add $69 to $198 a year, and Alen gives its own airflow figure instead of AHAM smoke, dust and pollen ratings.	Levoit publishes one CADR and one power figure, and no independent listing for this model could be confirmed.
Key specifications	Clean air delivery rate: 255 CFM on high by Alen's own CADRi figure; 80, 120 and 190 CFM on the lower speeds. No separate smoke, dust or pollen CADR on Alen's page. Room size: 950 sq ft at 2 air changes an hour or 1,900 sq ft at 1, by Alen's figures. Its FAQ says up to 1,600 sq ft. Noise: 24 dB on the lowest speed to 50 dB on high Power draw: 1.6 to 64 W in the spec table; the FAQ says 50 W on high. Alen doesn't say which setting draws 1.6 W. Filter life: Essential (Pure) 9 to 12 months; Advanced (Fresh) and Ultimate (Odor) 6 to 8 months, running 24/7 Filter price: $69, $89 or $99 each; 10% off on subscription ($62.10, $80.10 or $89.10) Ozone: Optional ionizer: under 0.001 ppm when on, 0 ppm when off. Alen lists CARB certification.	CADR: 250 CFM; Levoit gives one figure, not separate smoke, dust and pollen ratings Room size: 388 ft² at 4.8 air changes an hour; 1,862 ft² at 1 Noise: 23 to 54 dB; 26 dB or less in sleep mode, per the filter page; no per-speed figures Power draw: 50 W rated (51 W in the manual); no high, low or standby figures Filters: Washable pre-filter plus one combined main and activated carbon filter Filter life and price: 6 to 12 months; $49.99 standard, $59.99 Pet Allergy or Toxin Absorber, $64.99 Smoke Remover Controls: Auto, sleep, four fan speeds and a timer on the unit; pet mode, quiet auto, schedules and filter tracking in the VeSync app Size and weight: 15.6 × 8.5 × 19.8 in; 13.2 lb
Exact variant	US BreatheSmart 45i	Vital 200S-P, Black / LAP-V201S-WUS
Dimensions	25 in high, 15 in wide and 8.5 in deep, and 14 lb, according to the product page. Alen's support table lists the 45i/FLEX at 19 × 11 × 28 in and 23 lb. That's the same size it gives for the shipping box.	15.6 × 8.5 × 19.8 in (width × depth × height), or 39.6 × 21.7 × 50.2 cm. It weighs 13.2 lb (6 kg).
Installation	Freestanding, with no installation. It runs from a 24 V external power adapter. The manual asks for a level surface at least 6 in from heat sources such as heaters, with the vents left clear. The Alen Air app adds remote control, scheduling and filter alerts over Wi-Fi.	No installation. It sits on the floor or another flat, stable surface and runs from the included AC adapter (24 V, 2.5 A). The manual asks for at least 15 in (38 cm) of open space in front. Keep it away from curtains, damp spots and heat sources, and 5 ft from where oxygen is in use.
Materials	One filter cartridge with a prefilter you can vacuum. Essential (Pure) is a True HEPA (H13) filter aimed at dust, pollen, dander, mold and allergens. Advanced (Fresh) adds activated carbon for VOCs, smoke and cooking odors. Ultimate (Odor) adds an odor neutralizer for pet and diaper smells. An optional ionizer can be turned on or off. The front panel comes in White, Oak, Weathered Gray, Brushed Stainless, Graphite or Espresso.	It has three stages: a washable pre-filter, a main filter and an activated carbon layer for smoke, odors and fumes. Levoit says the main filter traps 99.97% of particles at 0.3 microns. The main and carbon stages come as one replaceable filter. Levoit calls that filter HEPA-grade only in sleep mode. The carbon is FSC-certified wood carbon. The manual doesn't mention an ionizer or UV lamp. It carries a California Prop 65 warning for lead.
Warranty	Alen gives a 1-year manufacturer's warranty. Its Forever Guarantee extends that if you register the serial number and use only Alen filters. You also need an active filter subscription or proof of an Alen filter purchase in the last 12 months. If troubleshooting can't fix a fault, you get a new unit in year two. From year three you get a refurbished or reconditioned unit, and the guarantee page sets no end date. Alen's support page says to register within 12 months of purchase. The guarantee doesn't transfer and excludes accidental damage, floods and fires. The product page says it needs an active subscription, but the guarantee page also accepts a recent filter purchase.	2 years from the original purchase date, covering defects in materials and workmanship. Registration isn't required, and the warranty doesn't transfer to a later owner. Filters count as normal wear and aren't covered, and neither is commercial use. Only units bought from Levoit or an authorized seller qualify. Claims need the invoice and order ID, with the serial number and date code intact. Levoit decides whether to repair, replace or refund.
Returns	60-day trial on orders from alen.com. Alen refunds the purchase but deducts return shipping, using a FedEx label it emails you. Opened filters can't be returned. The refund can take up to 7 business days after the warehouse receives the return. Orders from other retailers go back through that retailer. Alen doesn't say whether the 60 days start at purchase or delivery.	Levoit offers a 30-day money-back guarantee on direct purchases, counted from delivery. The unit must go back in its original packaging with all accessories, and excessively worn or used items are refused. Levoit emails a prepaid label once it approves the return, and you have 15 days to ship it. The policy doesn't say whether opened filters can be returned.
Unresolved questions	Smoke, dust and pollen CADR from AHAM or Energy Star testing Whether CARB's own list includes the 45i (Alen's linked order file has no readable text) Average power on auto, so the yearly electricity cost Whether the store ships the original 45i or the touch-control 45i V2 named in Alen's CARB and Energy Star files The true size and weight, since Alen's product page and support table disagree How long a filter lasts if you don't run it around the clock How often subscription filters ship	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 250 CFM figure refers to Power draw at each fan speed and in standby Noise at each fan speed Whether the $59.99 Pet Allergy or $64.99 Smoke Remover listing includes one filter or two Which color ships from the $189.99 listing Whether opened filters can be returned

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.