●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.