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China is affected by the fog is very heavy, masks become the necessaries of life. With exhaust valve masks more expensive than ordinary mask a lot of, but on the actual valve can be recycled. Detachable type exhaust valve can be used with ordinary mask, it can fast cutting normal masks, quick and convenient installation, light quality, small volume, wide application, low cost, can be recycled. Can let people easier breathing, save more cost. Modular design, can quickly remove a variety of color style can undertake collocation.
beijing city university
China Beijing meifutong Environmental protection technology co., LTD