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Filtration Accuracy and Selection of Primary and Medium Efficiency Air Filters

December 28,2021

The key to affecting the filtering accuracy of the filter is the filter element. Different filter elements can be selected according to the needs of the following components to achieve the corresponding filtering accuracy.

  1. Selection of low efficiency filter – air filter determines the efficiency of the last stage of air filter according to the indoor cleaning and purification standards, and reasonably selects the combination stage and efficiency of air filter at all levels. If general purification is required indoors, primary filter can be used; If medium purification is required indoors, two-stage filters of primary effect filter and medium effect filter shall be used; If ultra clean purification is required indoors, three-stage purification filtration of primary efficiency, medium efficiency and high efficiency shall be adopted, and the efficiency of filters at all levels shall be reasonably and properly matched. If the efficiency difference between adjacent two-stage filters is too large, the former filter will not protect the latter filter.
  2. Selection of low efficiency filter – air filter correctly determines the dust content and dust particle characteristics of outdoor air. Because the filter is to filter and purify the outdoor air and send it indoors, the dust content of outdoor air is a very important data. Especially in the multi-stage purification and filtration treatment, the selection of pre filter shall be determined after comprehensive consideration of factors such as operating environment, spare parts cost, operation energy consumption, maintenance and supply.
  3. Low efficiency filter selection – the air filter correctly determines the filter characteristics. The filter is mainly characterized by filtration efficiency, resistance, penetration rate, dust capacity, filtration wind speed and treatment air volume. If conditions permit, filters with high efficiency, low resistance, large dust capacity, moderate filtering wind speed, large processing air volume, convenient manufacturing and installation and low price shall be selected as far as possible. This is the economic analysis need to comprehensively consider the one-time and multiple performance and energy efficiency ratio in the selection of air filter.
  4. Selection of low efficiency filter – air filters to analyze the properties of dusty gas. The properties of dusty gas related to the selection of air filter are mainly temperature, humidity, acid and alkali and the amount of organic solvent. Because some filters are allowed to be used at high temperature, while some filters can only work at room temperature and constant humidity, and the amount of acid-base and organic solvent of dusty gas has an impact on the performance and efficiency of air filters.

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