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Dyson purifier Big+Quiet Formaldehyde.
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Dyson purifier Big+Quiet Formaldehyde.

Dyson Purifier Big+Quiet Formaldehyde BP04 (Prussian blue/Gold)

Purifies large spaces.¹ Quietly.

Captures allergens and 99.97% of particles as small as 0.3 microns.

Detects and destroys formaldehyde, permanently.⁴ Removes gases and odours.² 

Only at Dyson: exclusive K-Carbon filter technology captures 3x more NO₂ ³, and CO₂ sensor reports CO₂ levels in real-time.

Dyson Purifier Big+Quiet Formaldehyde BP04 (Prussian Blue/Gold)

Overall rating

100% of reviewers would recommend to a friend.

BP04 Dyson Purifier Big+Quiet is a Game Changer


We received this brand-new purifier last week and were very impressed with the functionalities, quietness, and improved coverage area for larger rooms. First off, setup was easy and under 15 minutes including adding it to our existing MyDyson app. Love the additional CO2 monitoring over our old HP04 Hot+Cool purifier. We put the machine in our family room which is next to the kitchen. Right the way we notice that our cooking smell dissipates much quicker when this machine is turned on. No more high-power noisy cooking fan is required now. The machine is super quiet yet very powerful as you can feel that the air is moving around the ground floor of our home constantly which is likely why there is no oscillation required for this new model and you can angelate the air flow. It's a game changer esp. with the recent wildfires causing poor air quality. The temperature and humidity measurements are quite close to our smart thermostat. The only minor drawback that we can think of is the size of the machine but it does have hidden rolling wheels at the bottom for ease of movement. Overall. this is definitely worth the extra money (incl. those higher costs on replacement HEPA and carbon filters likely due to the larger size of the machine) as an investment for our better health and well-being.

  • Weight

    11.9 kg

  • Cord length

    1.8 m

  • Number of speed settings


  • HEPA filter

    Glass fiber HEPA filter

Dyson purifier Big+Quiet Formaldehyde.
  • Height

    830 mm

  • Length

    434 mm

  • Width

    415 mm

In the box

Dyson Purifier Big+Quiet Formaldehyde BP04 (Prussian Blue/Gold)

Frequently asked questions

What is the Dyson Big+Quiet Formaldehyde air purifier range designed to do?​

Sources of formaldehyde can include woods, glues, paints, varnishes, air fresheners, mattresses, household cleaners, and some fabrics found in household flooring and furniture. The Dyson Formaldehyde air purifier range includes a catalytic filter that traps formaldehyde in tunnels, breaking it down into water an CO₂.⁴

What exclusive technology do I get when I buy the Dyson Big+Quiet Formaldehyde direct from Dyson?

Our Direct exclusive model comes in a new Prussian blue and gold colour. It has a K-Carbon filter that adsorbs 3x more NO₂³ – a common indoor pollutant. And a new integrated sensor that detects and reports CO₂ levels, notifying you when they exceed recommended limits.⁸

How long does the Dyson Big+Quiet Formaldehyde filter last?​

The Dyson Purifier Big+Quiet Formaldehyde has our largest ever filtration system. We recommend replacing the HEPA filter after using it for up to five years or sooner. The activated carbon filter should be replaced every two years or sooner if required. The selective catalytic oxidiation filter is permanent and never needs replacing. ​

Where should I place the Dyson Purifier Big+Quiet Formaldehyde in my room?​

The Dyson Purifier Big+Quiet Formaldehyde has been designed to work from the corner of a room, at least one metre away from the wall. For optimal performance we recommend projecting air either along a wall or across the room. You can adjust the angle of projection to suit your preference. ​

How easy is the Dyson Purifier Big+Quiet Formaldehyde to move?​

The Dyson Purifier Big+Quiet Formaldehyde has discreet wheels which are not visible when the product is upright. These wheels are designed for hard floors – so you can move your purifier around easily.

Dyson Purifier Big+Quiet Formaldehyde in a large space.

Latest Technology

Projects air over 32ft to purify large spaces.¹ Quietly. 

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