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In the box

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

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

Overall rating

94% 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

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 99.97% of ultrafine particles², 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™ app⁶ – 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 100m². 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.

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 99.97% of ultrafine particles², such as dust, allergens, odours, gases³ like benzene and nitrogen dioxide and even formaldehyde gas.⁵

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