What is the difference among low, middle and high efficiency filter?

Primary filter is suitable for pre-filtering air-conditioning systems, mainly for the filtration of dust 5um above particles. Primary filter has (folded plate, bag) three styles. Frame materials paper box, aluminum frame, galvanized frame, non-woven filter material, nylon mesh, activated carbon filters, metal hole net. Efficiency filters are widely used in the intermediate filtration air conditioning system, mainly used to filter dust particles 1um ~ 5um, with a small resistance, large air volume advantages. Efficiency filter bag and has a frame, modular and so on. High efficiency filter is divided into a separator filters without partitions and two kinds.

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