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

Overall rating

94% 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!

  • 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

Frequently asked questions

Which is the best air purifier?

The Dyson Purifier Big+Quiet Formaldehyde is our most advanced, quietest, and most powerful air purifier. As our latest top-of-the-range purifier, it uses cone aerodynamics to deliver powerful, long-range air projection – circulating purified air and driving even distant pollutants back through sealed filters. For whole-room purification – capturing 99.95% of ultrafine particles, even in large spaces.¹ You can control your air quality, wherever you are. At the touch of a button you can monitor the air quality levels in your home using the MyDyson™ app⁵ – viewing in real-time the benefits of owning an air purifier.

Are bigger purifiers better?

Not all purifiers are equal. Getting the right size purifier, with the best projection is essential to ensure it will effectively purify the air in your space. We've tested the Dyson Purifier Big+Quiet  Formaldehyde extensively – to ensure the sensors, filtration system and motor work together to purify a large living space. It has the projection power to purify spaces up to 32 feet.¹ The Dyson Purifier Big+Quiet Formaldehyde also has our largest ever filtration system – and the 360° HEPA H13-grade filter doesn't need replacing for up to 5 years.⁹

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

The Dyson Purifier Big+Quiet Formaldehyde air purifier range is engineered to remove 99.95% of ultrafine particles, such as dust, allergens*, odors, gases² like benzene and nitrogen dioxide and even formaldehyde gas.

How long do the filters in the Dyson Big+Quiet Formaldehyde last?​

The Dyson Purifier Big+Quiet Formaldehyde has our most advanced filtration system. We recommend replacing the 360° HEPA H13-grade 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 (SCO) filter is permanent and never needs replacing. 

Where should I position 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 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 aren’t visible when the machine is upright. These wheels are designed for hard floors – so you can move your purifier around easily.