Dyson’s Purifier Big+Quiet Formaldehyde BP04 is positioned as the brand’s quietest, most powerful, and most advanced air purifier. It is designed for large rooms and projects purified air over 32 feet, while also offering cooling airflow in warmer weather. It uses a three-stage filtration system combining HEPA H13-grade, K-Carbon, and Selective Catalytic Oxidization filters. The system captures 99.97% of particles down to 0.1 microns, destroys formaldehyde, adsorbs three times more NO₂ thanks to the exclusive K-Carbon filter, and alerts you when CO₂ levels are too high. The unit offers 10 speed settings, 50° oscillation, a curved magnetic remote, and full control via the MyDyson app.