Energy saving: Intelligent capture the changes of temperature, humidity, PM2.5, carbon dioxide concentration and other indicators, air supply on demand, energy consumption saving up to 30% under the same air conditions; Soundless: The inner units are placed outdoors, no fan and no noise indoors, solving the problem of noise and space crowding caused by the superposition of indoor equipments; Dust-free: Built-in HEPA filter which is currently the best internationally recognized high-efficiency filters, for 0.1 μm to 0.3 μm particulate matter filtration efficiency of 99.97%.