The Dyson Purifier Big+Quiet Formaldehyde is our biggest purifier yet, engineered from the ground up, to evenly purify large spaces. Cone aerodynamics creates a condensed jet of air to project purified air over 32 feet. Quietly. An advanced 360 HEPA H13 grade filter captures allergens and 99.97% of fine particles.⁴ Removes gases and odors.² Destroys formaldehyde, permanently.³Testing 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.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.⁴Particle challenge by DEHS oil specified in EN1822 within a chamber specified in ASTM F3150. Tested in Max Mode for whole machine efficiency above 99.95%.⁵Requires device to run app, Wi-Fi or mobile data, Bluetooth 4.0 support, and iOS version 10 or Android version 5 (or above). Standard data and messaging rates may apply. Refer to the MyDyson app for compatible voice services.