Central air conditioning, air-purifying technology used broadly divided into the following categories, they have their own strengths, and with advances in technology continue to improve. 1. Activated carbon adsorption filter advantages: Activated carbon is a porous carbonaceous material, has a highly developed pore structure, the porous structure of activated carbon to provide a large surface area of ??the central air-conditioning air sterilizers offer, with the gas (impurity) full contact, giving a unique adsorption properties of activated carbon central air conditioning air disinfection principle, making it very easy to achieve the purpose of the collection of impurities. Disadvantages: Ordinary charcoal does not adsorb all the toxic gas, low efficiency, easy desorption, large wind resistance. 2.HEPA net mechanical filter advantages: HEPA, Chinese meaning high efficiency air filters, to HEPA standard filter for particles 0.3 micron 99.99% efficiency central air conditioning air disinfection, features HEPA air through the net but small particles can not pass. HEPA filter by the Asian glass fiber membrane folded around a stack of continuous structure, forming a wavy washer is used to place and support the filter media. Disadvantages: filters need regular cleaning or updating, the higher cost of late. Today we will stop here, there will be follow-up after another supplement, please continue to take care of central air conditioning, air-purifying technology used broadly divided into the following categories, they have their own strengths central air conditioning air disinfection Which is good, and with advances in technology continue Perfection. 4. Nano photocatalyst nano technology is the use of titanium dioxide photocatalyst produce hydroxyl free radicals and reactive oxygen has an oxidation decomposition under UV irradiation, were potent bactericidal. Its combination of common and other formaldehyde, ammonia and benzene having a certain degradation. But only in the titanium dioxide particles as small as true nanoscale state, it can play an effective role. At this time the physical and chemical properties of titanium dioxide will change dramatically, the overall surface area will be massive increases in air can flow through the full contact with the surface of titanium dioxide, so as to achieve sterilization purposes. Wei, a VBK-G-duct air purification equipment product functions and features ◆ patented semiconductor disinfection purification technology: air conditioning by the National Testing Center, and just drag 6.3Pa, in line with <> standards; ◆ high disinfection efficiency: patented technology: by the Chinese Center for Disease Control and Prevention, one natural bacteria killing efficiency of 72%, continuing the cycle kill rate of 99%, in line with national health and family planning committee "disinfection technical specifications";