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          Indoor Air Purification

          The World Health Organization recommends that annual average value and daily average value of PM 2.5 should be 10μg / m³ and 25μg / m³. This reference value is also strict for European and American countries. In 2006, the United States revised the PM 2.5 standard, the average annual value and daily average value of 15μg / m³ and 35μg / m,while “the environmental air quality standard GB3095-2012 issued by the Chinese Ministry of Environmental Protection in 2012, the standard value of PM 2.5 is fixed at annual average value of 35μg / m³ and daily average value 75μg / m³. However, the implementation time of this standard is set at January 1, 2016.

                In order to reduce the extent of exposure to air pollution, people are hoping to create a cleaner air circulation system in relatively closed rooms. Air filtration membrane is one of the most effective air filtration materials in the world. The maximum interception efficiency of particulate matter of 0.3 microns (equivalent to 1/20 of hair) can reach 99.97%.
           
                At present, more than 90% of the air purifiers in the United States adopt membrane technology, which is widely used in Sweden, Switzerland and Germany. However, the innovative technology is still in the exploratory stage in China's purification industry. Air filter was born in the United States in 1940s after three years of "Manhattan plan", this plan built an atomic bomb, also left $1.4 billion asset, including a 9000 person of Los Alamos nuclear weapons laboratory. In the "Manhattan plan", in order to prevent the spread of radioactive contaminants in the air, researchers developed a membrane filtration efficiency, it is used to wear anti nuclear biochemical products, divided into H12 to H17 and other levels, the filtering efficiency is from 99.7% to 99.9999% as to the diameter of fine particles larger than 0.3 microns.

                Air filtration membrane made of interweaving of very fine organic fiber, the capture capability on the particle is very strong, small aperture, large adsorption capacity, high purification efficiency, and have ability to absorb water, purification rate for the 0.3 micron particle can reach to 99.97%. Therefore, the effect of filtering particles is very obvious. If you use it to filter cigarettes, the filter effect is almost 100%, because the particles in the cigarette are between 0.5 to 2 microns, it cannot pass through the air filter membrane.
          In the following decades, air filters played a key role in preventing the spread of airborne bacteria and viruses. The medical air filtration system also uses high-energy ultraviolet rays to kill living bacteria and viruses trapped in the filter medium. The system is widely used in precision laboratories, pharmaceutical production, atomic research and surgery, where high cleanliness is required.

             In addition, some new model cabins also use this filter. Modern aircraft use air membrane filters to achieve air recirculation to reduce the spread of pathogens in the air.
          In recent ten years, air membrane filtration technology has been used in civilian from military, medical, the air purifiers and dust-absorbing equipment widely used in the United States. In the past ten years, this technology has broken through the two major technical bottlenecks. The first is the service life of air filters, extending from the previous months to years. In addition, because of the wind resistance is large for early air filter, wind pressure of ordinary axial fan is not enough, as the technology matures, the technology makes efficient air filter to successfully install in the air purifier.
           

               

              

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