20 April 2018

Dyson's new Pure Cool fans purify the air, too

Dyson has released the Dyson Pure Cool purifying fans, which bring together Dyson’s expertise in airflow, filtration and electronics to tackle the issue of indoor air pollution and purify every corner of the room1.

Pioneering purification Dyson first entered the purifying fan category in 2015 in response to the increasing global problem of indoor air pollution. According to Dyson, most of the air we consume is from indoors2, and it can contain microscopic particles which are invisible to the human eye. Urban pollution, particulate matter and pollen can enter the office and combine with indoor pollution sources like cleaning products, then remain trapped inside.

The new Dyson Pure Cool purifying fans – in a large tower format for floor placement, and a small desk format for worktops and floors – automatically purify the whole room properly3, capturing gases and 99.95% of ultrafine particles as small as 0.1 microns4.

Dyson designs its purifying fans to go beyond test chamber conditions and focus on real conditions.
Paul Dawson, VP, Dyson Health and Beauty, said: “At Dyson we develop machines for real people and real homes, creating technology that works well in the test lab but more importantly doing what they’re expected to do in a real-world setting. To clean the air at home, a purifier needs more than a filter. It needs to automatically sense pollution, capture gases and ultrafine particles, and project clean air to every corner of the room. The Dyson Pure Cool purifying fan does all of this5, making it the only purifier fan to clean a whole room properly3.”

Dyson Pure Cool fan features include:


A new LCD display shows which particles and gases the Dyson Pure Cool purifying fan is automatically sensing in real time. A unique Dyson algorithm processes the input from three sensors and then displays air quality readings.

Lasers measure and detect ultrafine particles.  A separate sensor detects the amount of volatile organic compounds (VOCs) such as benzene and formaldehyde, emitted from paint, burning candles and materials in furniture, and nitrogen dioxide (NO2) present. NO2 can cause respiratory problems and acid rain. A third sensor measures relative humidity and temperature.

Dyson engineers calibrated the sensors inside the Dyson Pure Cool purifying fans with scientific particulate readers. An array of 30 Dyson sensors have sat alongside air quality monitoring labs in both King’s College London in the UK and Peking University in Beijing, China to understand how Dyson sensors react and ensure they are delivering the same feedback as academic equipment.

The sensors were left running outside in boxes for six months across three seasons in dirty, hot, wet and freezing conditions to gather long-term running information. Collecting 288 measurements a second gave Dyson engineers over 5 billion data points for analysis and meant the most effective calibration possible could be applied to the new generation of machines.


Dyson filters meet the filter industry standards EN1822 and H13-A. An improved filter in the new Dyson Pure Cool purifying fan captures both particulate matter and gases. Dyson engineers have incorporated 60% more high-efficiency particulate air (HEPA) media into a taller and deeper filter, and introduced three times more activated carbon. Activated carbon can absorb gases, odours, domestic fumes and VOCs while HEPA filters capture particles such as pollen, pet dander, dust mites, and tobacco smoke.

Nine metres of condensed and sealed borosilicate microfibre filters capture 99.95% of particle pollution as small as 0.1microns2, including allergens, bacteria, pollen and mould. Activated carbon filters, which have been coated with trishydroxymethylaminomethane to increase the absorption efficiency, remove gases including NO2, formaldehyde and benzene.


The Dyson Pure Cool purifying fan can distribute clean air efficiently. By expanding the degree of oscillation to 350⁰ degrees and using Air Multiplier technology, the machine can project 290 litres of purified air per second to every corner of the room1.

To avoid a cooling effect in winter, the Dyson Pure Cool purifying fan features a unique new diffused airflow mode. While the forward airflow mode cools the air, the diffused airflow or purification-only mode purifies the air without cooling it.


Dyson Pure Cool purifying fans are integrated with the Dyson Link app 4.1, which has been designed for iOS and Android. The Dyson Link app enables owners to track indoor and outdoor pollution, temperature and humidity levels. It can also be used to control the machine and estimates how many hours of filter life are left.

The new machines also come with full Over the Air Update Capability (OTA) – meaning Dyson owners can continue to get the most advanced Dyson software even after purchasing the machine6.


Dyson purifying fans are designed to work in real environments. Some manufacturers of conventional air purifiers gauge their performance using a laboratory test method called clean air delivery rate. It is conducted in a compact chamber 12m2 in size, with an added fan to circulate the air - and only one sensor to measure air quality. It is not representative of the average living room environment.

Dyson engineers created the POLAR test, which is based on a larger living room size, with no added fan, and eight sensors in the corners of the room plus one sensor in the centre collect air quality data every 5 seconds.

Evan Stevens, Head of Engineering for Dyson Environmental Control said: “We needed to test our machines in an environment that reflects how our owners actually use their machines and the rooms in which they are used. So we built a chamber without a ceiling fan, made it 27m2 in size, and added nine sensors capable of detecting particles 300 times narrower than a human hair. 3D mapping our machine’s performance in this chamber lets us know that when our machine says the air in a room is clean, it truly is clean.”

Dyson has continued to pioneer purifying fans globally, leading new test methods in China, the world’s largest market for air purifiers. In January 2018, China’s Household Appliance Standard and Technology Industry Alliance7 released the first accreditation for intelligent air purifying fans – featuring test methods first developed on Dyson’s UK Technology Campus. Dyson is the first company to test its machines according to this new standard.

According to Dyson, sources of pollution can include:

Tree pollen, particulate matter and city pollution, which can enter the building and may remain trapped there.

• Pollen: Plants and flowers can release microscopic pollen into the air.

• Scented candles: Some chemical substances found in scented candles can release benzene and formaldehyde into the air as they burn.

• Furniture foam: Foam that can be found in furniture can release formaldehyde gas

• Indoor paints: Some indoor paints can use volatile organic compounds, which can be released as gaseous chemicals when they dry and potentially throughout their life

• Air fresheners: Some household air fresheners can contain volatile organic compounds and benzene, which can be released with the fragrance when sprayed.

• Cleaning products: Household cleaning products can contain benzene and household fumes and odours.

• Carpets, rugs and flooring: Some carpets, rugs, flooring and their backing materials can emit formaldehyde when new and potentially throughout their life.


The new Dyson Pure Cool purifying fans come in two versions - a larger tower format for floor placement, and a smaller desk format for desks, worktops and floors. There is a two-year parts and labour guarantee8.

The Dyson Pure Cool purifying fans are available on shop.dyson.com.sg, and major departmental and electrical stores from late May 2018.

Dyson Pure Cool Desktop purifying fan (DP04)
Dyson Pure Cool Tower purifying fan (TP04)

Source: Dyson. The Dyson Pure Cool Desktop purifying fan.
Source: Dyson. The Dyson Pure Cool Desktop purifying fan.

The Dyson Pure Cool Tower purifying fan.
Source: Dyson. The Dyson Pure Cool Tower purifying fan.

S$899 (White/Silver and Iron/Blue)
S$949 (Black/Nickel)
Available in White/Silver
Available in White/Silver, Iron/Blue, Black/Nickel

1At the maximum setting. Tested to Dyson internal test method TM-003711 in a 27m2 room and DTM801. Editor's note: There is no online explanation available of what DTM801 stands for.

2US Environmental Protection Agency. 1989. Report to Congress on indoor air quality: Volume 2. EPA/400/1-89/001C. Washington, DC, US.

3The AHAM AC1-2015 standard sets out how air cleaner manufacturers can define their performance by “the relative reduction of particulate matter suspended in the air in a specified test chamber”. This means their performance is based on cleaning efficiency rates only.

4Tested to GB/T18801 (formaldehyde, benzene). Gaseous capture rates vary. Tested to EN1822 - airborne particles as small as 0.1 microns.

5Tested to Dyson internal test method TM-003711 in a 27m2 room. 'Harmful'/'ultrafine' pollutants refer to airborne particles as small as 0.1 microns (tested to EN1822).

6Standard data and messaging rates may apply. App functionality may vary by location. Requires Wi-Fi and app-enabled device.

7An affiliation of China’s leading home appliance agency – China’s Household Electronics Appliances Institute (CHEARI).

8For details, see the product manual.