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Dyson HEPA Big+Quiet Formaldehyde logo

Dyson's quietest, most powerful air purifier yet.

Purifies rooms up to 100m², evenly.1
Engineered for professional environments such as offices, classrooms and hotels.

The Dyson HEPA Big+Quiet Formaldehyde.
The Dyson HEPA Big+Quiet Formaldehyde purifying an office space.



  • Fixed angle

    Cord length
    Carbon filter life
    8,760 hrs
    Standby power consumption
    Low airflow setting
    50 ltrs/second
    Room coverage
    Quiet setting

  • High airflow setting
    90 ltrs/second

    Maximum setting
    HEPA filter life
    21,900 hrs


It's our business to understand air pollution, so yours doesn't suffer

Workspaces can harbour pollutants such as viruses, bacteria, Volatile Organic Compounds (VOCs), pollen and formaldehyde. Everyday items such as cleaning products and printers, furniture and flooring, can release potentially harmful microscopic particles, and remain in the air for many years.3

A large living space and the sources of various pollutants.


Dyson purifiers remove these common pollutants from commercial environments

  • Paint, varnishes and printers


  • Traffic, building materials and furniture

    Benzene and VOCs

  • Fumes and cooking


  • Pollen, dust and allergens


  • Bacteria and mould


  • Ultrafine particles


Engineered to purify large spaces

Fully-sealed to HEPA H13 standard to capture 99.95% of pollutants as small as 0.1 microns.4 Purifying rooms up to 100m², evenly.1

A large living space with the Dyson HEPA Big+Quiet Formaldehyde purifying the room.


Senses, captures and destroys

  • The conic amplifier top section of the purifier.

    Senses and reports CO2 levels

    1.44 inch LCD screen displays carbon dioxide readings and airflow mode – senses and reports air quality levels in real time.

  • The filtration system within the Dyson purifier.

    Whole-machine HEPA 13 filtration2

    Three phases of purification draw pollutants in from all directions. And the whole machine is fully sealed to HEPA H13 standard – so what goes in, stays in.

  • A formaldehyde molecule.

    Destroys formaldehyde, continuously3

    The solid-state formaldehyde sensor works simultaneously with a selective catalytic oxidisation filter, to destroy formaldehyde molecules 500x smaller than 0.1 microns.

Powerful and quiet

The high-velocity, low-pressure system produces low noise levels of just 55.6dB.

The HEPA Big+Quiet Formaldehyde in a library.

Acoustically engineered

The Helmholtz silencer traps sound energy and reduces low frequency noise, while the motor mount reduces vibration – so the little noise you hear, is quiet even at full power.

The Dyson digital motor.


Additional features

  • HEPA filter

    The HEPA filters contain 21 metres of borosilicate microfibres, pleated over 450 times, and lasts 21,900 hours.

  • Activated carbon filter

    430,000m² of activated carbon captures microscopic particles, and lasts 8,760 hours.

  • Single button operation

    Two airflow speeds to increase or decrease airflow when needed.


Frequently asked questions

Our latest purifier is acoustically engineered to operate quietly – even at its highest power setting. So it reduces your exposure to pollution, without disturbing you at the office or in the classroom. It records just 55dBA of sound power at full speed.

In Dyson’s latest purifiers, it’s not just the filter that meets HEPA H13 standard, it’s the whole purifier. So they don’t just capture pollutants, they prevent them from leaking back into the air you breathe. High-pressure seals at 24 critical points, combined with Dyson’s fully-sealed filtration system, means our whole purifier meets HEPA H13 standard. So what goes inside, stays inside.

Some manufacturers publish dB readings based on Sound Pressure levels, which can be easily manipulated by changes in the environment. They might also be tested at low fan speeds which can limit purification performance.

At Dyson we measure and publish Sound Power levels dB(A) – the pure reading taken directly from the machine – at maximum fan speed, where purification is at its optimum.

Increased CO2 levels can impact cognitive function. Our latest purifier senses and reports CO2 levels and notifies when they exceed recommended levels, alerting on the LCD screen when to ventilate.


11Test completed in a 100 m2 (12.7m x 7.9m) room with the purifier placed in one corner and source of pollution in opposite corner. The room had 36 sensors to determine PM2.5 distribution and purification. Results may vary in practice.
2Particle 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%.
3Third 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.
4Tested for filtration efficiency at 0.1 microns (EN1822, ISO29364).
5Tested to JEM 1467 (acetic acid, acetaldehyde, ammonia), GB/T18801 (formaldehyde, benzene) and DTM-003282 (NO2). Gas capture rates vary.
6The ability of purifying a large room up to 100m2 (10m*10m) proven from a Computational Fluid Dynamics (CFD) modelling, with the purifier placed in a corner of the room running at the maximum flow and horizontal projection reaching 10 metres to fully mix the room. The projection distance was measured from internal flow reach testing under the maximum directional airflow. The actual performance in real life condition may vary.