This stylish, Scandi-inspired air purifier doubles up as a side table – and it’s ideal for open-plan spaces

Air purifiers aren't always the prettiest appliances to add to a home, but the Blueair Blue Signature Air Purifier promises to blend a stylish, practical side table design with impressive air-purification technology.

To see if it has what it takes to compete with the best air purifiers out there, I tested it for two weeks in my home. This is what I found out.

In a nutshell

The Blueair Blue Signature air purifier quickly became the kind of appliance you forget is even on (in the best possible way). The design is a big part of that. Its low, furniture-like shape and usable top surface help it slot neatly into a living room layout, so it feels more like part of the decor than something you have to hide in a corner.

It’s also clearly built for larger spaces, with specs promising a high-capacity purifier suitable for rooms of around 65 m². In everyday use, that matters more than any single headline feature, because it dictates how often the fan needs to ramp up and how much noise you actually end up living with.

And while the 7-stage HEPASilent filtration system plus OdorFence to eliminate odours sounds intense, it’s reassuringly quiet on its lowest setting, while more noticeable at Boost - as expected.

However, pricing is a key consideration. At around £369 full price, I’d be weighing its quiet performance and low energy draw against the ongoing cost of replacement filters. Especially when air purifier competition is rife.

Specifications

• Recommended room size: 65 m² (approx. 705 sq ft)
• Air changes per hour: 4.8 to 5 ACH
• CADR (Clean Air Delivery Rate): Pollen: 450 cfm; Dust: 434 cfm; Smoke: 455 cfm.
• Noise levels: 23 dB to 55 dB.
• Filter type: 7-stage filtration system including a washable fabric pre-filter, HEPASilent particle filter, and activated carbon with OdorFence technology.
• Dimensions: 44cm x 40cm x 40cm (H x W x D).
• Weight: 6 kg (approx. 13.2 lbs).
• Wattage: 3.5 W to 42 W.
• Smart app connectivity: via the Blueair app (Wi-Fi supported).
• Timer/scheduling: Customisable through the connected app.
• Auto mode: Includes an "Auto Fresh Mode”

How I tested

Caroline Preece

I tested the Blueair Blue Signature for around two weeks in my basement flat in Suffolk, using it exactly as I would any air purifier I planned to keep long term. That meant leaving it running through normal life at home (working from home, bedtime, and cooking) so I could focus on the things that matter most for Ideal Home readers: how quickly it reacts, how much you notice it in the room, and whether it feels easy to live with over time.

Alongside everyday use, I ran Ideal Home-approved air purifier tests to see how quickly it detected a drop in air quality, how it behaved in Auto mode, and how long it took to bring things back to a clean baseline.

Unboxing and setting up

The Blueair Blue Signature arrives in a sturdy, branded cardboard box with protective inserts that keep the unit secure in transit. It feels suitably premium for a purifier that’s designed to sit in the middle of a room rather than be tucked away out of sight.

Inside the box, you get the Blueair Blue Signature itself with the Particle and Carbon filter already installed, plus a washable fabric pre-filter (in Nordic Fog for my sample) and the user manual. That’s everything you need to get started, aside from making space for it and deciding where it will work best.

There is some plastic involved. The outer packaging is cardboard, but the unit itself is wrapped in plastic to keep the filters fresh. It’s also worth noting that Blueair filters aren’t currently recyclable in standard household recycling, so you’ll need to dispose of them as general waste or follow local e-waste guidance where available.

In practical terms, setup is quick. Blueair pitches it as a seamless unbox-to-play experience, and I found it realistic to be up and running within about three minutes. The basics are genuinely plug-and-play. Once it’s powered on, the motion-activated capacitive touch controls light up as you approach, so you don’t have to hunt for buttons in a dim room.

If you want the smart features, you’ll need the Blueair app and a Blueair account. To put the unit into pairing mode, press and hold the Auto button on the top for about five seconds until the LED begins blinking. While the manual includes a QR code for downloading the app, I find it’s often quicker to search for “Blueair” in the App Store or Google Play instead.

Design

The Blueair Blue Signature is unapologetically design-forward, and that’s very much the point. It has a low, square footprint and a flat top, designed to sit next to a sofa or bed like a side table, rather than shouting “appliance” from the corner of the room. It also wouldn’t look out of place on a larger bedside table.

Visually, it leans into a minimalist Scandinavian aesthetic, with a soft, fabric-wrapped base and a more premium-feeling tabletop. The standard unit comes in two core finishes, Midnight and Nordic Fog, but you can further customise the look with interchangeable fabric pre-filters in colours including Warm Grey Dune, Archipelago Taupe, Aurora Green and Night Waves.

Blueair also sells optional extras, such as wooden table legs, if you want it to feel even more like an occasional table.

On the practical side, it has a fairly substantial presence at around 40cm by 40cm, but it stays visually grounded because it’s only 44cm tall.

In most UK living rooms, that height works well beside a sofa or armchair, and the top is sturdy enough to support lightweight items up to 5kg, so it can genuinely earn its floor space rather than just occupying it.

The controls are deliberately discreet. You get five capacitive touch buttons along the top front edge: power, fan speed (four levels), Auto, Night mode, and display lock. There’s also a dot-matrix “Wave-to-Wake” display that lights up only when the motion sensor detects you nearby, plus five LED light strips on the front that change colour to indicate air quality, ranging from blue (excellent) to red (very polluted).

Because it pulls air in from all sides, placement matters more than it does with a slimmer tower purifier. Blueair recommends leaving around 10cm of clearance so the 360-degree intake can do its job. In my experience, that’s easiest in an open corner or beside seating, rather than wedged tightly between pieces of furniture. It’s also easier to move than it looks: at 6kg, you can relocate it when needed without it becoming a two-person job.

Performance

The Blueair Blue Signature is built to be the kind of purifier you can switch on, forget about, and trust to do its job. Its headline specs are clearly aimed at larger rooms: Blueair says it can clean 705 ft² in 12.5 minutes and up to 3,385 ft² in an hour. Under the hood, it uses a multi-stage system that targets both particles and odours, with seven stages of filtration (and a claimed 99.97% removal rate down to 0.1 microns) plus an OdorFence layer designed to tackle smells far more effectively than standard carbon filters.

To keep things grounded in real life, I focused on two main questions: how quickly it reacts to changes in the air, and how calm and unobtrusive it feels once the room has settled back to normal again.

For a standard smoke check, I lit a scented candle very close to the unit, starting from a clean-air baseline. In testing, the Blueair Blue Signature took about 30 seconds to respond before the readings spiked sharply, reaching the red “polluted air” level and staying there for about 5 minutes.

In Auto mode, you really see what this model is built to do. The fan jumps quickly up to its highest setting to scrub the air, then gradually eases back down as the readings improve. The recovery is reassuring: it returned to “good” in about five minutes and to “excellent” in around 10.

For the next test, I used an aerosol deodorant, spraying for about 5 seconds from about 3 feet away. The Blueair Blue Signature responded immediately, with PM10 levels rising to nearly 200 within minutes. Its response was both faster and noisier than during the smoke test, which reassured me that the filtration is up to the job in more extreme, real-world scenarios.

This is where the OdorFence layer is meant to earn its keep, with Blueair claiming it’s up to 10 times more effective at removing stubborn odours than standard carbon filters. If you use sprays regularly, it’s worth leaning on manual fan control or app scheduling rather than relying on the sensors to do all the work.

For my cooking fumes test, I made dinner in a slightly-dirtier-than-I’d-like-to-admit air fryer oven in an open-plan kitchen-living space, with the Blueair Blue Signature positioned in the living area rather than directly next to the hob. That detail matters because it took about two to three minutes for the purifier to detect a change once the fumes had drifted into its 360-degree intake.

At its peak, the PM reading ranged from 30 to 35, with the front light strips shifting to orange (“moderate”). From there, recovery was fairly brisk for a room of this size, returning to “excellent” (blue) in about 10 minutes.

What felt most convincing was what happened afterwards. The lingering smell faded faster than I expected, which lines up with Blueair’s OdorFence focus on odours. If you have an open-plan layout, I’d place it between the kitchen and the seating area so it can catch smells before they settle into soft furnishings.

Dust is where the Blueair Blue Signature felt most reassuring, because it’s exactly the kind of everyday pollution that tends to build up quietly, especially if you have pets or lots of soft furnishings (guilty). For this, I emptied a bag of clay cat litter into a container 1–1.5 metres from the unit, which is one of the dustiest tasks I do weekly. It reacted immediately, with the front light strip turning red in about 10 seconds.

What helps here is that the Signature tracks particulate sizes, including PM1, PM2.5, and PM10, so it’s well suited to detecting the fine, floaty particles you may not see settling on furniture.

Ease of use

The Blueair Blue Signature is, by design, a minimal-control air purifier. That can be a real plus in a busy home, because you don’t need to learn a complex interface to get the most out of it.

On the unit itself, you have four manual fan speeds, plus Auto and Night modes, and a display lock to avoid accidental taps. The idea is that you set it to Auto, let the sensors handle the ramping up and down, and only step in when you want an extra burst of airflow after something particularly smoky or strongly scented.

Night mode is the one I suspect most households will end up using regularly, simply because it prioritises low distraction. It keeps the fan speed gentle and dims the visual feedback, which matters more than you might expect once an appliance is in your eyeline for hours at a time.

If you use the app, the controls become more practical rather than more complicated. You can schedule it, dim the lights, enable child lock, and check your air quality history, which is helpful if you’re trying to spot patterns rather than fixate on a one-off spike.

The app also tracks filter life using Blueair’s RealTrack system, which calculates lifespan based on how often you use it and the pollution levels it’s actually dealing with, so you’re not just relying on a basic countdown timer.

Smart home support is solid but not universal. It works with Amazon Alexa and Google Assistant, but there’s no support for Apple HomeKit or IFTTT at the moment.

For a premium “smart” purifier, I’d also like more granular control over Auto mode sensitivity, especially if you want it to respond more aggressively to certain triggers.

Noise levels

Noise is the make-or-break detail for a purifier this size, especially if you want it in a bedroom. On paper, the Blueair Blue Signature runs from 23 dB on low to 55 dB on high, which is a promising range for something designed for larger rooms.

In everyday use, the lowest setting is the one you’ll forget about. It sounds more like a soft airflow than a “machine” noise, and from a sofa or bed, it’s easy to tune out, particularly if you already have the usual evening background sounds in the room.

Boost is a different story, but not an unpleasant one. At full power, it’s clearly audible, more like a steady desk fan than the higher-pitched whine you sometimes get with smaller, cheaper purifiers. I wouldn’t choose it for a quiet film night, but it’s perfectly tolerable for short bursts when you want to clear the air quickly.

For sleeping, Night mode is the obvious choice. It keeps the fan at its quietest level and dims the lights, so it doesn’t become a glowing distraction in a dark room. If you need a touch more airflow overnight, Speed 1 is a good compromise, as long as you also dim the app's indicators.

Portability

For a purifier designed for larger rooms, the Blueair Blue Signature is easier to move than its footprint suggests. It weighs 6 kg, which makes it a realistic lift-and-carry job between rooms if you need to follow the problem: cooking smells at dinner, dust in the bedroom later on.

That said, it’s not a slim little tower you can tuck under one arm. The Signature has a broad 40cm by 40cm base and stands 44cm tall, so you tend to carry it with two hands and need to be a bit more deliberate about where you set it down.

It also needs roughly 10cm of clearance around it for the 360-degree air intake to work properly, which can make it feel slightly “in the way” in narrow hallways or smaller home offices where every bit of floor space counts.

It makes the most sense in a living room or open-plan space, where the furniture-like shape feels intentional rather than intrusive. If you’re buying it with the idea of moving it often, I’d plan a couple of clear landing spots so it’s not constantly being squeezed into tight corners.

Energy use

This is one of the Blueair Blue Signature’s strongest practical wins. For a purifier designed for larger rooms, it’s surprisingly frugal, with a quoted power draw of 3.5–42 W depending on fan speed and mode. Blueair credits its low energy use to its HEPASilent approach, which combines mechanical filtration with electrostatic charging, enabling it to move a lot of air without a power-hungry motor.

To put that into real money, here’s how it breaks down at a unit rate of £0.245 per kWh (you can adjust this to your own tariff):

• Lowest (3.5 W): This works out at about £0.00086 per hour, so it takes a little over 12 hours to cost 1p.
• Highest (42 W): This comes in at about £0.0103 per hour, or roughly 1p per hour at full blast.

In day-to-day use, most people will run it on Auto or a low manual speed, with occasional bursts during cooking or cleaning. At that point, your ongoing costs are far more likely to be shaped by filter replacements than by your electricity bill.

Filter replacement

Filter maintenance on the Blueair Blue Signature is refreshingly low effort, and the app handles most of the admin for you. Instead of relying on a blunt timer, Blueair uses its RealTrack system to estimate filter life based on how much you use the purifier and the pollution levels it’s actually dealt with, which feels more useful in a home where air quality can shift with the seasons.

The main Particle and Carbon filter swap is tool-free and takes roughly two minutes. You lift the tabletop lid off, pull the old cylindrical filter out, and drop the new one in, with no fiddly locking mechanism to wrestle with. Once it’s replaced, you can reset the filter indicator in the Blueair app or hold the filter icon on the touch interface for about five seconds.

The cost to keep in mind is the replacement filter price. The main filter is £59 at Blueair, and they quote a lifespan of up to 12 months, depending on your environment and usage.

This model’s fabric wrap isn’t just decorative. It works as a washable pre-filter for larger dust particles and pet hair, helping to protect the main filter and maintain consistent airflow. You can vacuum it while it’s on the unit, or remove it and wash it on a low-temperature, delicate cycle. It takes about 30 seconds to remove and refit. Blueair recommends vacuuming the fabric every 1 to 2 weeks and gently cleaning the laser sensor window with a dry cotton swab every 6 months to keep Auto mode readings accurate.

Online ratings

At the time of writing, the Blueair Blue Signature is highly rated, averaging 4.8 out of 5 based on 112 reviews on the Blueair UK website. That kind of consistency usually tells you two things: the design is landing as intended, and people are seeing enough day-to-day improvement to justify giving it a spot in a main living space. Customers regularly highlight the furniture-like look, its ability to double as a side table, and how quiet it is on lower settings.

Performance feedback is similarly reassuring. Many owners mention quick clearance of everyday allergens and lingering cooking smells, which mirrors what expert reviews tend to focus on. Several reviews specifically call out that it’s quiet, easy to use, and effective at tackling odours and airborne pollutants.

The most common complaints are what you’d expect from a premium, high-capacity purifier. Replacement filters are seen as expensive. Boost mode can be noticeably loud (quoted at around 55 to 63 dB).

Should you buy the Blueair Blue Signature?

The Blueair Blue Signature makes the strongest case for itself if you want a furniture-grade, high-capacity purifier for a large living area, and you value rapid filtration, near-silent low-speed operation, and a trustworthy Auto mode over constant tinkering. It’s designed to cover up to 65 m², and the format genuinely helps it feel like part of the room rather than a utility box you’re trying to hide.

I also like it for open-plan homes, where smells and fine particles have more space to linger. With a multi-stage HEPASilent setup and OdorFence for odours, it’s well positioned for day-to-day “background cleaning”, then short bursts of power when cooking or dust kicks up. Running costs on electricity should be easy to live with, too, thanks to the low 3.5-42 W power draw.

I’d think twice if long-term consumables are your main concern. The replacement Particle and Carbon filter is £59 (up to 12 months), which is the cost you’re most likely to notice. And if you’re deep into Apple smart home setups, there’s no HomeKit or IFTTT support here, so it will sit slightly outside a fully integrated system.