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Only from Dyson Dyson purifier Big+Quiet Formaldehyde logo
Dyson purifier Big+Quiet Formaldehyde.
In stock in 10-14 days.
Dyson purifier Big+Quiet Formaldehyde.

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

Purifies large spaces.¹ Quietly.

Destroys formaldehyde, permanently.⁺

Removes gases and odors.² Captures 3x more NO₂.⁴

Captures allergens* and 99.97% of fine particles.

Senses and reports CO₂ levels in real-time.

Dyson's largest ever filtration system.

  • Weight

    26.24 lb

  • Oscillation/Angle

    50 degrees

  • Number of speed settings


Dyson purifier Big+Quiet Formaldehyde.
  • Height

    32.68 in

  • Length

    16.34 in

  • Width

    17.09 in

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

Overall rating

95% of reviewers would recommend to a friend.

Greatly improved air quality


When I first received it, I experimented and ran it in a smaller room that smelled musty and it cleared it right up in about an hour or two. I was astounded! It cleared out cooking odors in the kitchen, also. Not only does it operate so well, it's good looking too. I love the modern design of the unit and the mini remote that magnetically attaches to the front. It's a conversation piece for sure!

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 and CO₂.⁺

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 NO₂⁴ – a common indoor pollutant. And a new integrated sensor that detects and reports CO₂ levels, notifying you when they exceed recommended limits.​⁶

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 H13 grade HEPA filter after using it for up to five years or sooner. The K-Carbon filter should be replaced every two years or sooner if required. The selective catalytic oxidisation filter is permanent and never needs replacing. ​

What is formaldehyde and what are its common sources?

Formaldehyde is a polluting gas formed of carbon, hydrogen, and oxygen that is commonly found in homes. Sources of formaldehyde in your home could include paint and varnishes, air fresheners, mattresses, furniture, household cleaners, carpets, particleboard and plywood, electronics, dryer sheets, nail polish remover, moth balls, toys, fireplaces, and wood burning stoves.

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 three and a half feet 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.