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●Sub-frame structure, G3 White, G4 green and white; ●Low initial resistance, large capacity of dust; ●Can be cleaned, detachable, reused; ●Cost-effective, economical and practical.

●Can choose a variety of colors; ●Low initial resistance; ●One-time use, can not be recycled or reused; ●Large filtration area, price concessions.

●G3 White, G4 light green; ●Low initial resistance; ●Can be cleaned, detachable, reused; ●Economical and practical.

●Two kinds of craft: flat type; ●Low initial resistance and simple installation; ●Mainly adsorption odor; ●Can be cleaned and reused; ●Economical and practical.

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