Dyson Purifier Hot+Cool HP2 De-NOx delivers whole-room heating and powerful cooling with purified air. Advanced air purification captures 50% more NO . Removes odors and gases, and continuously destroys formaldehyde. The fully sealed, 3-stage filter system captures 99.97% of particles as small as 0.3 microns. The whole purifier, not just the filtration system, is fully sealed to HEPA H13 grade. Air Multiplier technology projects over 76 gallons per second of smooth, yet powerful airflow. Connects to the MyDyson app to control and monitor air quality from anywhere, or hands-free with compatible voice services. Gas capture rates vary. ²Refers to non-living material. Particle challenge with DEHS oil specified in EN1822 within a chamber specified in ASTM F3150.