Blueair (brand store)gray $299
Shippingabout 5–8 days
Returns–
Blueair Blue Signature Medium
Rank 5 of 9 robots for open-plan spaces in our ranking, tested by .in our ranking, tested by
Score 7.3 out of 10
Lab tests, 60% of the score: no lab has tested it.
Owners’ ratings, 25%: none yet at the stores that ship to the United States, so this part is left out and the others count for more.
Features, 15%: 7.3, 70 of the 96 points for the facts the maker states.
Price does not count, so a discount never lifts a model. Only robots a lab has tested are ranked.
The highest score today is 8.4.
Is the Blueair Blue Signature Medium right for your home? Find out in 7 questions →
Before you buy, compare it with 2 recommended alternatives
Beside it, two models on sale today that come closest to it on score and price, with the same kind of station where we have them.
Green is the best of these 3, also when they share the lead.
| This model Blueair Blue Signature Medium | Nearly as good, 25% cheaper Blueair Blue Pure 311i+ Max Best on 2 facts | Higher score, 23% cheaper Blueair Blue Pure 311i Max Best on 2 facts | |
|---|---|---|---|
| Price and ranking | |||
| Lowest price | $299Blueair (brand store) | $224Blueair (brand store) best | $229Blueair (brand store) |
| Score | best | best | |
| Rank | rank 5 of 9 for open-plan spaces | rank 2 of 9 for open-plan spaces | rank 1 of 9 for open-plan spaces |
| Customer rating | – | – | – |
| Station | |||
| Room size same on all | open-plan spaces | open-plan spaces | open-plan spaces |
| Size, noise and age | |||
| Height lower is better | – | 21 in (53.3 cm) | 19 in (48.3 cm) best |
| On the market since | February 2026 | April 2025 | December 2024 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Prices per store
On October 15, 2026 the lowest price for the Blueair Blue Signature Medium is $299 at Blueair (brand store), shipping to the United States included. In our ranking it is rank 5 of 9 for open-plan spaces, with a score of 7.3 out of 10.
All prices include shipping to the United States. Sales tax is added at checkout. We may earn a commission when you buy through these links. It never changes our ranking.
Blueair (brand store)gray Blueair (brand store)blue $299
Shippingabout 5–8 days
Returns–
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Price history
Lowest price per day Tap a store to hide or show its line.
Lowest since Oct 13$299
Highest since Oct 13$299
Price drops since Oct 130no drop seen yet
Blueair Blue Signature Medium specifications
The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.
Blueair · on the market since February 2026
Clean air delivery rate (CADR)321 cfm
Room size we compare on489 ft²
Noise at the lowest speed19 dB
Filter life12 months
Power at the highest speed36 W
Running cost: Running cost: about $102 a year, $69 for filters and $32 for electricity. Electricity at EIA Short-Term Energy Outlook, October 2026, on the 181 kWh a year its energy label states.
Consumables: The filter lasts about 12 months.
Cleaning performance 7 facts
- Clean air delivery rate (CADR)
How much clean air the purifier delivers an hour, measured with smoke, dust and pollen. A higher figure cleans a bigger room or the same room faster.
- 321 cfm (545 m³/h)
- CADR measured to
The test the CADR comes from. AHAM AC-1 and the DOE test are independent and comparable. A maker's own test is not.
- DOE test
- CADR for smoke
The CADR measured with tobacco smoke, the finest of the three test particles. It is the figure to read for wildfire smoke.
- 321 cfm (545 m³/h)
- CADR for dust
The CADR measured with dust.
- 309 cfm (525 m³/h)
- CADR for pollen
The CADR measured with pollen.
- 330 cfm (561 m³/h)
- CADR for fine particles (PM2.5)
The CADR measured for particles under 2.5 microns.
- 315 cfm (535 m³/h)
- Room size we compare on
The room size where the purifier changes the air 4.8 times an hour under a 2.5 m ceiling, worked out from its CADR. We use it so every model is compared on the same rule.
- 489 ft² (45 m²)
Filter 2 facts
- HEPA filter class
How fine the filter is. True HEPA and H13 catch at least 99.97% of particles at 0.3 microns. HEPA-type is a weaker claim with no test behind it.
- HEPA-type
- Activated carbon filter
A filter of activated carbon that takes out smells and some gases. It does not catch particles.
- yes
Running costs 2 facts
- Filter life
How long the maker says a filter lasts, in months of normal use. A filter that is spent cleans less.
- 12 months
- Energy use a year
- 181 kWh
Noise and power 5 facts
- Noise at the lowest speed
The sound level at the lowest speed, as the maker measures it.
- 19 dB
- Noise at the highest speed
The sound level at the highest speed, as the maker measures it.
- 54 dB
- Power at the highest speed
The power the purifier draws at its highest speed.
- 36 W
- Energy efficiency (IEF)
Air delivered for each watt, the ENERGY STAR measure. Higher is better.
- 10.2 cfm/W
- ENERGY STAR certified
Certified by ENERGY STAR for the energy it uses to clean the air.
- yes
Air quality sensing 1 fact
- Automatic mode
The fan speed follows the air quality the sensor reads.
- yes
Smart features and warranty 1 fact
- App control
- Wi-Fi
Build 1 fact
- Weight
What the robot weighs. It counts most if you carry it up a staircase every day.
- 9.5 lb (4.3 kg)
Extras 3 facts
- Ioniser
An ioniser charges particles so they settle. Some also make a little ozone, which is why a switch to turn it off matters.
- None
- CARB certified
Certified by the California Air Resources Board as making little ozone.
- yes
- Ozone produced
The ozone the purifier gives off, in parts per billion. California allows at most 50.
- 1 ppb
Warranty and certification 2 facts
- AHAM Verifide certified
The CADR is verified by AHAM, the US trade body that runs the test.
- yes
- Warranty
The warranty the maker gives in the United States.
- 1 year
Sources: data.energystar.gov · blueair.com · ww2.arb.ca.gov · ahamdir.com
Our score
Confidence: medium. One lab and fewer than 300 owners’ ratings. The highest score today is 8.4.
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Lab tests 60%–
Left out, so the other parts count for more.
-
Owners’ ratings 25%–
Owners’ ratings, 25%: none yet at the stores that ship to the United States, so this part is left out and the others count for more.
-
Features 15%7.3
70 of 96 points for the facts the maker states.
- Price never countsA sale can’t lift a model. Today’s lowest price sits beside the score, checked every morning.
- No test, no rankOnly robots a lab has tested are ranked. The rest get a provisional score.
- Reviewers beside, not insideReviewers’ picks are shown next to the score and do not count in it.
Frequently asked questions about the Blueair Blue Signature Medium
What size of room is the Blueair Blue Signature Medium for?
The Blueair Blue Signature Medium is sized for a room of about 489 ft², the room size we compare it on. Its clean air delivery rate (CADR) is 321 cfm, measured to DOE test.
How often does the Blueair Blue Signature Medium need a new filter?
The maker gives the filter a life of 12 months.
How loud is the Blueair Blue Signature Medium?
The maker states 19 dB at the lowest speed and 54 dB at the highest.
How much power does the Blueair Blue Signature Medium use?
It uses about 181 kWh a year on the maker’s test assumptions. At the highest speed it draws 36 W.
Does the Blueair Blue Signature Medium make ozone?
It is CARB certified, which means it stays under California’s limit of 50 parts per billion of ozone.
Is the Blueair Blue Signature Medium good for wildfire smoke?
Its CADR for smoke is 321 cfm. A higher number clears smoke from a room faster, so compare it with the size of your room.
The maker
Blueair
- Owned by Unilever
Blueair was founded in 1996 in Stockholm, Sweden, and was acquired by Unilever in 2016. It sells air purifiers and filters to American buyers through its own online store. Its US privacy notice names Blueair, Inc as the company behind the store, with an address in Chicago.
