The Dyson Purifier Big+Quiet Formaldehyde is our biggest purifier yet, engineered from the ground up, to evenly purify large spaces.¹ 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. Removes gases and odors.² Destroys formaldehyde, permanently.³ ¹Testing 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 in practice. ?Particle 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%. ?Requires 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.