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.
Removes gases and odours.² Exclusive K-Carbon filter technology - captures 3x more NO₂³. Only at Dyson.
Detects and destroys formaldehyde, permanently.⁴
Senses and reports CO₂ levels in real-time.
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Dyson Purifier Big+Quiet Formaldehyde BP04 (Prussian Blue/Gold)
Overall rating
Features
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Long-range projection and circulation
Our latest purifier uses cone aerodynamics to deliver powerful, long-range projection – circulating air and driving even distant pollutants back through sealed filters. For whole-room purification, even in large spaces.¹
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Quiet, even at full power
An acoustically engineered motor bucket records just 56dBA of sound power at full-speed. With no compromise on performance.
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Adjust your airflow
Adjust the angle of airflow at 0°, 25° or 50°, or mimic the feeling of refreshing air indoors using Breeze mode.
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Control your air quality wherever you are
The MyDyson™ app gives you autonomy over your air quality. View which particles have been captured, set schedules, browse reports, and more.⁷
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Auto mode
With the Auto mode feature, your purifier can sense, capture and report on pollutants in your home in real-time.
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Hygienic filter replacement
A hygienic replacement mechanism allows you to dispose of the HEPA filter in one click.
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Discreet wheels
Easily manoeuvre your machine across a room. Designed for hard surfaces, the wheels are completely hidden from view.
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Smart home purification
Connect and then control your air quality, hands-free, with compatible smart home voice services.¹²
Technology
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Adsorbs 3x more NO₂
Our K-Carbon filter is impregnated with potassium carbonate (K₂CO₃) and can adsorbs three times more nitrogen dioxide⁴ - one of the most common indoor pollutants, produced by gas appliances, open flames, and wood burning stoves.
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Senses and reports CO₂ levels in real-time
Increased CO₂ levels can impact cognitive function. Dyson Purifier Big+Quiet Formaldehyde intelligently senses and reports CO₂ levels, notifying when they exceed recommended volumes⁸, alerting you on the MyDyson™ app or LCD screen when to ventilate by opening a door or window.
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Senses and reports, automatically
A suite of sensors, including a lifetime solid-state formaldehyde sensor, detects pollutants across a whole room. Our unique algorithm cross-checks data every second, analyzing your air at a molecular level – automatically reacting to purify and display live results on the LCD screen and in the MyDyson™ app.
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Destroys formaldehyde, permanently⁴
A catalytic filter continuously traps and breaks down formaldehyde molecules into water and CO₂⁴. And it never needs replacing.
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Captures gases and ultrafine particles²
The HEPA H13 grade filter captures 99.97% of particles as small as 0.3 microns, while an activated carbon filter removes odours and gases.²
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Fully-sealed to HEPA H13 grade⁵
Three phases of purification sit within our fully-sealed machine to trap pollutants inside, removing them from the air you breathe. Giving you reassurance that what goes inside, stays inside.⁵
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Weight
11.9 kg
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Sound level (Max)
56 dBA
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Sound level (Quiet Mode)
38 dBA
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Cord length
1.8 m
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Number of speed settings
10
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HEPA filter
Glass fiber HEPA filter
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Height
830 mm
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Length
434 mm
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Width
415 mm
In the box
Dyson Purifier Big+Quiet Formaldehyde BP04 (Prussian Blue/Gold)
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Remote control
Curved and magnetized to store neatly on the machine.
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HEPA filter
Genuine Dyson HEPA Filter lifespan is 5 years.
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K-Carbon filter
Captures 3x more NO₂. Genuine Dyson Activated K-Carbon Filter lifespan is every 2 years or when alerted by the MyDyson™ app.
Frequently asked questions
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
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
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.
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.
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.
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Allergens
An allergen is a substance that can cause an allergic reaction by triggering the body’s immune system. Common indoor allergens include dust mite droppings, pet dander, mold, and pollen.
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Bacteria
Microscopic, single-celled organisms that exist in their millions, in every environment. Not all bacteria are harmful, but some can have adverse effects, such as E. coli.
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Benzene
Benzene is colourless, flammable liquid produced by both natural and man-made processes. It’s a natural part of crude oil, gasoline, and cigarette smoke. Indoors, it comes from products such as glues, paints, furniture wax, and detergents.
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Carbon dioxide (CO₂)
A colourless greenhouse gas, which comes from the extraction and burning of fossil fuels. Increased CO₂ levels can impact cognitive function.
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Formaldehyde
This colourless, flammable gas is used in some building materials and household products. Sources can include some fabrics found in flooring and furniture, glues, paints, varnishes, air fresheners, and household cleaners.
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H1N1 virus
This subtype of Influenza A virus, also known as swine flu, caused a global flu outbreak. H1N1 produces respiratory infectious diseases in humans and pigs. Symptoms can be similar to seasonal flu.
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HEPA 13
HEPA (High Efficiency Particulate Air) is an air filter efficiency standard and a measure of a filter’s performance. To achieve this standard, filters must meet a minimum of 99.97% particle removal at the most penetrating particle size.
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Humidification
A process of increasing air moisture content through the addition of water vapour or steam. Humidifiers can add moisture to the air in dry conditions, creating a more comfortable indoor environment when needed.
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Microns
Airborne particles are usually described in microns. One micron is equal to one-millionth of a metre. The human eye can see debris and dust that are approximately 25 microns in size.
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Nitrogen dioxide (NO₂)
Nitrogen dioxide is a liquid below 21.2 °C and a gas at higher temperatures. It is toxic to humans in both states. Gas stoves and space heaters are the most common indoor sources of NO₂ emissions. Other sources include improperly vented furnaces and water heaters.
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Pet dander
Pet dander is made up of tiny particles of skin, saliva and urine, shed by animals with fur or feathers. Pet dander lingers in the air before settling on surfaces such as furniture, bedding, and fabrics. Exposure to these airborne particles can trigger allergies.
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Particulate matter (PM)
Particulate matter contains microscopic solids or liquid droplets, measured in microns. Indoor PM can be generated through many day-to-day activities such as cooking, cleaning, and the burning of candles and fires.
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Purification
The process of making something free of any contaminants or physical impurities. Air purification is designed to filter the air in your home – removing pollutants such as dust, allergens and viruses.
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Volatile organic compounds (VOCs)
Volatile organic compounds are potentially harmful gases found in many household products. Common sources include paints, varnishes, air fresheners, cosmetics, and cleaning products.
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Pollen
Pollen is a powdery substance released from seed plants as part of their reproduction process. It typically appears from trees in the spring, grasses in the summer, and weeds in the autumn. Pollen grains are among the most common allergens.
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House dust mites
Dust mites are tiny insects that commonly live in household dust. They are one of the biggest causes of allergies. Each gram of house dust contains approximately 1000 dust mites.
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Aspergillus mold
A common name for a visible group of fungi, mould thrives wherever there is dampness – sending out millions of spores into the air. Exposure to mould occurs via inhalation, skin contact, or ingestion.
Recommended for you
Choose your model
Dyson Purifier Big+Quiet Formaldehyde BP04 (Prussian Blue/Gold)
Projects air over 32 feet to purify a large space.¹ Quietly.
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.
3 accessories included
See all-
Remote control
Curved and magnetized to store neatly on the machine.
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K-Carbon filter
Captures 3x more NO₂. Genuine Dyson Activated K-Carbon Filter lifespan is every 2 years or when alerted by the MyDyson™ app.
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HEPA filter
Genuine Dyson HEPA Filter lifespan is 5 years.
¹Testing for PM2.5 purification completed in a large testing chamber following relevant Dyson testing methods. Results may vary in practice.
²Tested to JEM 1467 (acetic acid, acetaldehyde, ammonia), GB/T18801 (formaldehyde, benzene) and DTM-003282 (NO2). Gas capture rates vary.
³Compared to adsorption by the standard carbon filter in Dyson Purifier Big+Quiet Formaldehyde (BP03).
⁴Third party full machine testing based on GB/T 18801-2022 formaldehyde cumulative clean mass testing with continuous injection until plateau of formaldehyde CADR is achieved. Results may vary in practice.
⁵Particle challenge by DEHS oil specified in EN1822 within a chamber specified in ASTM F3150. Tested in Max Mode at IBR US, for whole machine efficiency above 99.95%.
⁶Tested on Korean BBQ, grilled salmon, cat urine, tobacco smoke and garbage odours.
⁷App functionality may vary per market. Requires Wi-Fi and app enabled device. Standard data and messaging rates may apply. Requires iOS version 10 or above, or Android version 5 or above. Your mobile device must have Bluetooth 4.0 support.
⁸Levels defined by Dyson based on scientific literature. Ventilation alert when CO2 levels are 1500ppm or above.
9In maximum setting. Tested for air projection (DTM 801) and purification coverage in a 81m3 room (TM-003711).
10In Auto mode.
11Vs. TP09
12Refer to the MyDyson™ app for compatible smart home devices and voice services.
13Primary airflow achieved at projection angle of 50°
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