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

Whole-Room Power, Half the Noise

The Big+Quiet Formaldehyde BP04 is built for large, open spaces without the large-machine noise. Acoustically engineered to run 50% quieter than any other Dyson purifier in Night mode, it still projects over 21 gallons of purified air per second, with airflow adjustable to 0°, 25°, or 50° — or a Breeze mode that mimics natural, refreshing air movement indoors.

Its most advanced filtration system pairs a HEPA H13-grade filter with a K-Carbon filter, capturing fine particles, gases, and formaldehyde permanently rather than just trapping it temporarily. A dedicated CO₂ sensor tracks indoor air quality continuously and alerts you when levels climb too high, while the HEPA filter is rated to last up to 11 years, cutting long-term maintenance down significantly.

Everything is sensed, logged, and controllable from the MyDyson app or included remote — monitor what's been captured, browse detailed air quality reports, and set schedules from anywhere. Auto mode keeps energy use in check by purifying only when pollutant levels actually rise, and hidden wheels on the base make it easy to reposition on hard floors.

Key Features

• 50% Quieter in Night Mode: Acoustically engineered for minimal disturbance, even at full power
• Formaldehyde Detection & Destruction: Permanently breaks down formaldehyde rather than just capturing it
• Powerful Air Projection: Delivers 21+ gallons of purified air per second across large rooms
• Long-Lasting HEPA H13 Filter: Rated for up to 11 years of use
• CO₂ Sensor & Alerts: Notifies you when carbon dioxide levels are harmfully high
• App + Remote Control: Monitor air quality, set schedules, and adjust settings from the MyDyson™ app or remote

Specifications

• Filtration: HEPA H13-grade filter + K-Carbon filter, captures formaldehyde, NO₂, and fine particles
• Filter Life: HEPA filter up to 11 years; K-Carbon filter recommended replacement every 2 years
• Noise Level: 50% quieter than other Dyson purifiers in Night mode
• Air Projection: Over 21 gallons of purified air per second, adjustable 0°/25°/50° angles, plus Breeze mode
• Sensors: CO₂ sensor with alerts, continuous particle and gas monitoring
• Connectivity: MyDyson™ app control, included remote control
• Mobility: Hidden base wheels for easy repositioning on hard floors
• Color: Prussian Blue/Gold
• Included Accessories: HEPA filter, K-Carbon filter, remote control