Filtration efficiency Filtration efficiency dust filter media structure on the one hand and on the other hand also depends on the layer of dust on the filter is formed from the filter structure, the filtration efficiency of short fibers is higher than the long fibers, felt filter fabric ratio filter high. From the point of view of the formation of the dust layer, the thin filter after cleaning, the dust layer is damaged, much lower efficiency, and thick media, but also to retain a portion of the dust after cleaning the filter, avoiding excessive cleaning. Generally, in the case where the filter is not broken, it can achieve maximum efficiency, so long as the design parameters properly, the effect of dust filter should be no problem. Dust holding capacity Dust holding capacity, also known as dust load, means reaches a given value of the resistance per unit area of accumulated dust filter and (kg / m2). Dust holding capacity filter media impact resistance and cleaning cycle. In order to avoid the rather complicated cleaning and prolong filter life, generally require some maximum filter dust. The porosity of the filter dust holding capacity and air permeability related to felt fabric filter media than the amount of dust. Air permeability and resistance Permeable filter means at a certain pressure, the amount of gas per unit area through the filter on. Filter resistance and permeability directly related. As the air permeability of the calibration constant pressure value, the value of different countries. Japanese wood, the United States take 127Pa, Sweden take 100Pa, Germany take 200Pa, so consider experiments taken differential permeability of selected size. Ventilation rate depends on the fineness of the fibers, fiber reactor types and weaving methods. Swedish press information filament fiber filter air permeability 200–800 m / (m ˙h), short silk fiber material trip air permeability 300-1000 m³ / (m² ˙h), felt filter 400-800 cubic meters of air permeability / (m² ˙h). The higher the permeability, allowing the air flow per unit area (load ratio) the greater. Permeability generally refers to the cleaning of filter media permeability. When the dust accumulated on the filter cloth, the permeability to lower. Depending on the nature of the dust, general ventilation rate as a starting gas permeability (permeability when a clean filter) 20% -40%, and for the fine dust, or even only 10% -20%. Breathable string lowered to improve the collection efficiency, the resistance has greatly increased. Life Cartridge life means the filter under normal use conditions Explosion break time, filter life depends on the length of the filter itself, the quality (materials, weaving, post-treatment process, etc.) and conditions (temperature, humidity, dust properties, schungite mode, etc.) two factors. Under the same conditions a good dust removal process design can also extend the life of the filter.