SIDE BY SIDE
See prices, running costs, specifications and trade-offs side by side. Choose two to four products of the same type.
Our pick for a small bedroom or office
US model, store item 109994, with one Particle + Carbon filter and an Arctic Trail pre-filter
$99.99US price, checkedLow-cost purifier for one room up to about 190 ft², with filters at $48 a year
Check price at Blueair for Blueair Blue Pure 511 Full review →
Our pick for a medium room
US model; particle and carbon filter included
$229.99US price, checkedLight, quiet purifier for rooms up to 439 ft², with $44.99 filters every 6 to 9 months
Check price at Blueair for Blueair Blue Pure 311i Max Full review →| Criterion | Blueair Blue Pure 511 | Blueair Blue Pure 311i Max |
|---|---|---|
| US price | $99.99Checked Oct 13, 2026 · Price details in the review | $229.99Checked Oct 13, 2026 · Price details in the review |
| Three-year ownership estimate | $243.93 Incomplete known subtotal. Not included: energy use. | $499.93 Incomplete known subtotal. Not included: energy use. |
| Choose if | A bedroom or office up to about 190 ft² where you want a cheap, simple purifier with low filter costs. | A bedroom or office up to 439 ft² where you want low noise, app control and optional smoke or allergen filters. |
| Main trade-off | It covers only one small room, and it has three manual speeds with no air sensor or auto mode. | Filters run about $60 to $90 a year, and the three-year warranty depends on registering within 60 days. |
| Key specifications |
|
|
| Exact variant | US model, store item 109994, with one Particle + Carbon filter and an Arctic Trail pre-filter | US model; particle and carbon filter included |
| Dimensions | 13.4 × 7.9 × 7.9 in (height × width × depth). It weighs 4.2 lb. | 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. Plug it in and it blows clean air out the top. Blueair's page links no manual, so it doesn't say how much wall clearance it needs. | 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 | A single Particle + Carbon filter sits behind a washable pre-filter. Blueair says the filter captures PM2.5, pollen, dust mite allergen and pet dander allergen. The carbon is aimed at light household odors such as smoke and cooking. Blueair calls the system HEPASilent, a mix of electrostatic and mechanical filtration. Pre-filters come in Arctic Trail, Night Waves and Winter Reed. | 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 | One year from purchase, or two if you register. Blueair's warranty page gives 60 days to register, in your Blueair account or the app. That page doesn't name the 511, so the two-year term comes from the product page. You need to replace filters on Blueair's schedule and keep proof of purchase. Coverage is for the original owner only, and warranties aren't available through third-party resellers. In the first year a defective unit is exchanged for a new or equivalent one. During the registered extension, the replacement is refurbished. Coverage ends if the unit leaves the continental US or Canada. Filters are covered for 30 days. | 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 | 30 days from purchase for items bought directly from Blueair, sent back with Blueair's prepaid label. Filters and pre-filters that are used or out of their plastic wrap can't be returned. Shipping charges, including the $5 flat rate, aren't refunded. Blueair takes 10 to 14 days to process a return. The refund then reaches your original payment method within 3 to 5 business days. | 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 |
|
|
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.