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The rapid development of air filters is closely related to the development of military industry and electronic industry. In the first world war, the use of various chemical agents, asbestos fibre filter paper as the smoke filter layer of military gas masks came into being. The glass fiber filter medium is used in air filtration to obtain a patent in the United States in October 1940. In the 1950s, the United States studied the production process of glass fiber filter paper, and the air filter was improved and developed. In the 1960s, HEPA filters came out; In the 1970s, the filter paper of fine glass fiber was used as the HEPA filter of filter medium, and the filtration efficiency of particle size of 013 micron particle diameter was 99.9998%. Since the eighty s, with the emergence of new test method, use evaluation to improve and to improve the filtering performance requirements, found the HEPA filter there is a serious problem, and he had a higher ULPA filter performance. Countries are still working on it and expect more advanced air filters soon Antivirus software packages are something ought to be positioned in every computer which uses the Internet on daily basis. Without Computer repair, computer may be hanged and will get infected by causing it slow. Your computer keeps you protected from browsing the Internet or even loading programs. Antivirus purchased in stores or shops could cost you up to $150 or more with regards to the software you get. Avltechno are only supplying the antivirus software?s at lowest price fortunately, there are numerous different antivirus programs that could be easily downloaded and installed however, not secured.

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