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One of the suggestions I built to the property owner was that he should add some protocols for the company?s security policy regarding how managers handle cash payments from customers plus include some rules about after hours usage of shop facilities and shop equipment. To my surprise, the dog owner said his company had no security policy. At the time, I was surprised. But since then I have realized more and more smaller businesses (even some medium sized-businesses) who have no written security policy. Of those businesses who actually stood a written security policy, many we had not reviewed or updated their policy in many years.
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
Automatic filter is to filter industry widely used a set of equipment, to overcome the traditional filtering products, volume is small, vulnerable to contamination jams, filtering, part of the need to remove the cleaning and unable to monitor the state of the filter and so on shortcomings, with the raw water filter and automatic filter for the discharge of pollutants by automatic cleaning function.
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