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Medium-efficiency bag filter is mainly used to filtrate the dust particles with the diameter of 0.5μm and above. It has the advantage of more filtering area, high dust holding capacity, low resistance, and can be washed and used repeatedly, etc.
Bag filters are extensively used in the ventilation systems of the central air conditionings and the purification of pharmacy industry, hospital, electron industry, and food industry, etc.
Additionally, they can also be used in the front end filtration of the high-efficiency air filters to reduce their loads and prolong their service lives. Bag filters have dust holding capacity and low wind speed because of their big windward area. Therefore, they are regarded as the best medium-efficiency filter structure up to present.
They use new-type complex nonwovens or imported minute glass fiber and imported synthetic fiber and are covered with reinforcing and molding filter materials. They have bag-shaped moulds and are equipped with all kinds of metal outside frames (galvanizing plate, iron plate, and aluminum alloy, etc.)
Generally, there are three kinds of filtering materials used, namely, complex nonwovens, synthetic fiber, and glass fiber.