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●Two kinds of craft: 1, Bag type, 2, box type; ●Low initial resistance and good breathability; ●Large adsorption capacity, high wind volume; ●The main adsorption odor.

●W-box-type filtration; ●Low initial resistance and good breathability; ●Large volume of dust; ●Gale volume.

●Aluminum frame bag type can be disassembled and reused, not washable; ●Low initial resistance and good breathability; ●Large volume of dust and high filtration efficiency; ●Economical and practical.

●It is divided into two kinds: frame bag type; ●G3 White, G4 green and white; ●Low initial resistance, good air permeability, large volume of dust; ●can be cleaned and reused; ●Economical and practical.

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