Dyson Purifier Big+Quiet Formaldehyde Review: Perfect for large spaces


Large, highly effective and spectacular, the Dyson Purifier Big+Quiet Formaldehyde may take up loads of house, however if in case you have large rooms (or open plan spaces), and need to hold your air clear, there’s nothing extra highly effective. With a variety of air high quality sensors, this air purifier reacts rapidly to pollution and offers with them effectively and rapidly. It’s costly, however you received’t be dissatisfied with this air purifier’s outcomes.


  • Glorious vary of sensors
  • Extraordinarily highly effective
  • Very quiet

  • Tasks air over 10 metresIs able to purifying large rooms in your house

  • 360-degree filtration systemCaptures 99.5% of ultrafine particles.


Dyson actually doesn’t mess about with its product names: it’s clear that the Dyson Purifier Big+Quiet Formaldehyde is a large air air purifier, constructed to scrub the most important of rooms.

With an enormous vary of sensors, a long-lasting filter and exceptionally quiet efficiency, should you’ve obtained house for this air purifier, you’ll recognize it. The excessive value and large dimension does imply it’s not one for the lots.

Design and options

  • Filters last as long as 5 years
  • Appropriate with MyDyson app
  • Adjustable air movement

Keep in mind the Dyson Pure Cool Me desktop fan? Nicely, the Dyson Purifier Big+Quiet Formaldehyde seems to be like an even bigger model of this. And, by larger, I do imply BIGGER – it is a monster of an air air purifier.

Measuring 830 x 434 x 415mm and weighing 11.9kg, this air air purifier seems to be like a Star Wars Droid, and wishes a good quantity of house to position it. It’s mounted on casters, so it’s comparatively straightforward to slip the air purifier round, however you’ll nonetheless solely need to put this in a reasonably large room.

Dyson says that the Dyson Purifier Big+Quiet Formaldehyde can venture clear air 10m and is appropriate for rooms as much as 100m², which is able to cowl big rooms and even total open-plan layouts.

There are two variations of this product accessible, with barely totally different options. I’ve the dearer Dyson Purifier Big+Quiet Formaldehyde, which is completed in Prussian Blue, and has a wider vary of options.

There’s additionally the Dyson HEPA Big+Quiet Formaldehyde, which is cheaper, completed in white, doesn’t work with the MyDyson app, doesn’t have a distant management and doesn’t have an adjustable airflow angle.

In contrast to earlier Dyson purifiers that I’ve reviewed, such because the Dyson Purifier Scorching+Cool Formaldehyde, the Dyson Purifier Big+Quiet Formaldehyde is just not particularly a cooling fan as nicely. It shoots out a burst of air, but it surely’s not as straightforward to direct it, neither is the airflow as focused. Purchase this product since you desire a air purifier, not a multi-function machine.

Arrange is simple, because the Dyson Purifier Big+Quiet Formaldehyde comes with pre-installed filters, so the machine simply wants pulling out of the field and plugging in to get began. Filters can final for as much as 5 years, at which level it’s £60 for a brand new HEPA filter and £60 for an activated carbon filter.

Changing the filters is simple: pull off the pinnacle, press within the clips to slip the exterior shroud up, after which the HEPA filter may be pulled up and out, and the carbon filter unwrapped from the within. It’s then a matter of doing the job in reverse to reassemble the air purifier.

Dyson Purifier Big+Quiet Formaldehyde inside
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Neatly, the exterior shroud may be rotated, so the magnetic distant management holder may be moved to the place that you really want it in.

The HEPA filter is designed to seize small particles (99.95% of ultrafine particles right down to 0.1 microns in dimension), and the carbon filter is designed to seize gases (benzene, NO2 and extra). There’s additionally a selective catalytic oxidation filter for formaldehyde, which turns the dangerous substance into CO2 and oxygen and by no means wants changing.

Dyson Purifier Big+Quiet Formaldehyde filtersDyson Purifier Big+Quiet Formaldehyde filters
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As with Dyson’s purifying followers, the distant management can be utilized for full management over the fan, together with manually altering the fan velocity, and adjusting the path of the air purifier’s output.

As with the Pure Cool Me, the Dyson Purifier Big+Quiet Formaldehyde takes benefit of the Coanda impact, the place air follows the trail of a curved floor.

Dyson Purifier Big+Quiet Formaldehyde remoteDyson Purifier Big+Quiet Formaldehyde remote
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By default, the air purifier makes use of Breeze mode, which is designed to simulate an actual Spring breeze, however the prime and backside jets may be adjusted, altering the angle of the air. It’s a helpful trick to have.

I discovered that adjusting the airflow meant that I might have the air purifier on with out being sat in a stream of chilly air.

Dyson Purifier Big+Quiet Formaldehyde angleDyson Purifier Big+Quiet Formaldehyde angle
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Whereas the fan velocity may be adjusted manually, it makes extra sense to depart the Dyson Purifier Big+Quiet Formaldehyde in Auto mode. Due to the big selection of sensors onboard, the air purifier can react to a number of pollution, altering fan velocity on demand.

Sensors can detect the quantity of particulate matter, that are small particles within the air. There are sensors for PM2.5 (very small particles) and PM10 (small particles). A VOC sensor detects dangerous gases, and there are additionally sensors for NO2 (usually attributable to vehicles) and formaldehyde. There are additionally temperature and humidity sensors for completeness, plus an total air high quality ranking that takes into consideration readings from all sensors.

Dyson Purifier Big+Quiet Formaldehyde screenDyson Purifier Big+Quiet Formaldehyde screen
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Such a variety of sensors signifies that the Dyson Purifier Big+Quiet Formaldehyde is way more aware of air high quality points than purifiers that solely detect particulate matter. I discovered that the fan would spin up after I opened the kitchen door, detecting pollution from outdoors. Spraying polish to scrub a desk, the air purifier detected elevated particulate matter, and spun up its fan.

What Dyson purifiers do make you discover is simply how variable air high quality is, and what number of instances you’re uncovered to pollution.

In addition to utilizing the distant, the Dyson Purifier Big+Quiet Formaldehyde may also be linked to Wi-Fi and may be managed utilizing the MyDyson app, house to all the firm’s good units, together with the Dyson 360 Vis Nav robotic vacuum cleaner.

Dyson Purifier Big+Quiet Formaldehyde appDyson Purifier Big+Quiet Formaldehyde app
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In addition to replicating all the controls accessible by way of the distant, connecting the app offers voice management by way of Amazon Alexa and the Google Assistant, plus historic data going again seven days displaying historic air high quality, plus graphs of readings from the person sensors.


  • Cleans air quick
  • Very quiet

Basically day-to-day use, the Dyson Purifier Big+Quiet Formaldehyde is spectacular. Its wide-ranging sensors imply that any impurity within the air is detected and handled quick, returning the air high quality to the inexperienced stage. Impressively, the air purifier solely will increase fan velocity to the purpose the place it must clear the present downside, and it’s comparatively uncommon to have it spin up to the mark 10.

When the air purifier does hit most velocity, the large fan and intelligent design imply that it’s nonetheless quiet: simply 49.8dB from 1m away in my exams. Basically use, it’s just about unimaginable to listen to this air purifier working, and it’s not distracting within the slightest.

To see how rapidly it will probably clear the air, I lit a smoke pellet, which burns for round 60 seconds. I discovered that the Dyson Purifier Big+Quiet Formaldehyde took simply 6m 11s to clear my workplace of smoke and have the Nest Shield report that the alert was over.

The Dyson Purifier Big+Quiet Formaldehyde did keep on for a complete of 15m 50s till it reported the air was utterly inexperienced: the fan velocity was slowly diminished over this era. Total, that is the quickest and strongest air air purifier that I’ve examined.

Newest offers

Do you have to purchase it?

You need highly effective air cleansing

Extraordinarily highly effective and really quiet, this air purifier rapidly reacts to a variety of pollution and retains indoor air clear.

You don’t have a lot house or desire a fan too

For those who reside in a smaller house with smaller rooms, another might go well with you extra. Likewise, if you’d like a multi-purpose machine, look elsewhere.

Remaining Ideas

It takes up a good quantity of room, so the Dyson Purifier Big+Quiet Formaldehyde is de facto solely designed for these with large rooms and loads of house. It’s additionally the most costly air air purifier that I’ve reviewed. That stated, if in case you have large rooms (or open plan house) and desire a responsive, quiet and highly effective air air purifier, they don’t come higher than this.

If you would like one thing extra versatile for a smaller house, then the Dyson Purifier Scorching+Cool Formaldehyde could also be a more sensible choice, because it’s a heater and fan, as nicely; in any other case, my information to the most effective air purifiers might help.

How we check

In contrast to different websites, we check each air air purifier we overview totally over an prolonged time period. We use business customary exams to check options correctly. We’ll at all times inform you what we discover. We by no means, ever, settle for cash to overview a product.

Discover out extra about how we check in our ethics coverage.

Used as our primary air air purifier for the overview interval

We check good purifiers with their apps and we check Amazon Alexa and Google Assistant compatibility.

We time how lengthy it takes every air purifier to take away smoke from a closed room.

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Is the Dyson Purifier Big+Quiet Formaldehyde a fan in addition to a air purifier?

It outputs a jet of air, however this isn’t a cooling fan within the conventional sense and is designed for air purification.

How lengthy do the filters on the Dyson Purifier Big+Quiet Formaldehyde final?

Filters can last as long as 5 years relying on utilization – the app will inform you when it’s time to exchange them.

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