Blueair Blue Signature Large

Not sold at any shop we monitor today, so not in our ranking.

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Before you buy, compare it with 2 recommended alternatives

No shop here sells this model today, so beside it the highest-scored model for the same room size that one does, and the cheapest of the top 10.

Green is the best of these 3, also when they share the lead.

Price and ranking
	This model Blueair Blue Signature Large Best on 1 fact	Highest score here Clean Air Optima CA-503 Compact Best on 2 facts	Cheapest of the top 10 Xiaomi Smart Air Purifier 4 Compact
Lowest price	–	132 €OTTO best	189 €OTTO
Score	best
Rank	–	rank 1 of 1 for small rooms	rank 2 of 2 for medium rooms
Customer rating	–	–	–
Room size
Room size	open-plan spacesup to 65 m²	small roomsup to 30 m²	medium roomsup to 27 m²
Size, noise and age
Height lower is better	43.7 cm	27.4 cm best	35.5 cm
On the market since	June 2025	–	–

Show full comparison →

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.

Blueair Blue Signature Large specifications

The numbers that matter first, then every fact by group. As published by the maker or the shop we read it from.

Blueair · on the market since June 2025

Clean air delivery rate (CADR)773 m³/h

Room size we compare on64 m²

Noise at the lowest speed23 dB

Filter life12 months

Power at the highest speed42 W

Running cost: Electricity: about 86 € a year. Electricity at BDEW-Strompreisanalyse August 2026, on the 235 kWh a year its energy label states.

Consumables: The filter lasts about 12 months.

Cleaning performance 8 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.: 773 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.: 773 m³/h
CADR for dust The CADR measured with dust.: 737 m³/h
CADR for pollen The CADR measured with pollen.: 765 m³/h
CADR for fine particles (PM2.5) The CADR measured for particles under 2.5 microns.: 754 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.: 64 m²
Room size the maker claims The room size the maker states. Makers use different rules, so we show it but never rank on it.: 65 m²

Filter 3 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
Filter layout Whether the particle and carbon layers are one filter or separate ones. Separate filters let you replace only the part that is spent.: One combined filter
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: 235 kWh

Noise and power 5 facts

Noise at the lowest speed The sound level at the lowest speed, as the maker measures it.: 23 dB
Noise at the highest speed The sound level at the highest speed, as the maker measures it.: 55 dB
Power at the highest speed The power the purifier draws at its highest speed.: 42 W
Energy efficiency (IEF) Air delivered for each watt, the ENERGY STAR measure. Higher is better.: 11.1 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 2 facts

App control: Wi-Fi
Matter
Matter is the standard that lets devices from different makers work together. With it you can run the robot outside the maker’s own app. On this model: Assumed, not a stated fact: the maker's full specification does not name it, so we take it as no.: no (assumed)

Build 5 facts

Shape: Floor box
Height How tall the purifier is. It decides whether it fits on a shelf or under a window sill.: 43.7 cm
Width: 393.7 mm
Depth: 393.7 mm
Weight What the purifier weighs. It counts most if you move it from room to room.: 6 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.: 3 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 Germany. Consumer law here stands apart from it and can last longer.: 1 year

Sources: data.energystar.gov · blueair.co.uk · blueair.com · ww2.arb.ca.gov · ahamdir.com

Our score

Confidence: medium. A CADR the maker states itself, or fewer than 300 owners’ ratings. No model scores higher today.

Owners’ ratings 40%–

Owners’ ratings, 40%: none yet at the shops that deliver to Germany, so this part is left out and the score is the features part alone.
Features 60%7.3

70 of 96 points for the maker’s and the registers’ facts.

Price never countsA sale can’t lift a model. Today’s lowest price sits beside the score, checked every morning.
No CADR, no rankOnly air purifiers with a known CADR 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.

How we work this out →

Frequently asked questions about the Blueair Blue Signature Large

What size of room is the Blueair Blue Signature Large for?

The Blueair Blue Signature Large is sized for a room of about 64 m², the room size we compare it on. Its clean air delivery rate (CADR) is 773 m³/h, measured to DOE test.

How often does the Blueair Blue Signature Large need a new filter?

The maker gives the filter a life of 12 months.

How loud is the Blueair Blue Signature Large?

The maker states 23 dB at the lowest speed and 55 dB at the highest.

How much power does the Blueair Blue Signature Large use?

It uses about 235 kWh a year on the maker’s test assumptions. At the highest speed it draws 42 W.

Does the Blueair Blue Signature Large make ozone?

It is CARB certified, which means it stays under California’s limit of 50 parts per billion of ozone.

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.