Air purifier air purifier called "air cleaner" air cleaner, purifier, is the ability to adsorption, decomposition or transformation of various air pollutants (generally including PM2.5, dust, pollen, odors, such as formaldehyde decoration pollution, bacteria, allergens, etc.), improve air cleanliness of household appliances, mainly divided into domestic, commercial, industrial, buildings. Air purifiers in a number of different techniques and media, to enable it to provide a clean and safe air to the user. Air purification technology commonly used are: adsorption technology, negative (positive) ion technology, catalyst technology, photocatalyst technology, ultra-light mineralized structure technology, HEPA efficient filtration technology, electrostatic dust collection technology; materials technology are: photocatalyst, activated carbon, pole filter carbon core technology, synthetic fibers, HEAP efficient materials, negative ion generator. Existing air purifier much more expensive than the complex, which simultaneously uses a variety of techniques and materials purification media. How it works: the air purifier is mainly composed of motors, fans, air filters and other system components, and its working principle is: the motor and fan inside the machine so that circulation of indoor air pollution of all kinds will be through the air inside the filter contaminant removal or adsorption, certain models of air purifiers will be installed at the outlet of the negative ion generator (when working in high-pressure ion generator produce negative high voltage), will continue to ionizing air to produce large amounts of negative ions, are micro Fans sent, the formation of negative ions stream, to clean air purification purposes. Application areas: air purifier in the home, medical, industrial fields have applications, home field standalone class home air purifier market mainstream products. The main function is to remove the air of particulate matter, including allergens, indoor PM2.5 and so on, but also can solve the interior due to renovations or other causes, underground space, interior volatile organic air pollution. Since the release of a relatively closed space air pollutants have persistence and uncertainty characteristics, so the use of air purifiers indoor air is one of the internationally recognized way to improve indoor air quality. Applications: 1, just renovated or refurbished homes. 2, the elderly, children, pregnant women, newborns home. 3, there are accommodations asthma, allergic rhinitis and pollen allergy personnel. 4, keeping pets and livestock housing. 5, more closed or subjected to passive smoking accommodation. 6, hotels, public places. 7, consent to the high quality of life of people in homes. 8, hospitals, reduce infection and prevent the spread of disease.