Produces air filters and their components, air purification equipment, provides after-sales services, and sells self-produced products; similar products to the above, as well as water filters, medical devices Class I, medical devices Class II, metal material products (except silver), textile raw materials and their products, chemical products (except dangerous goods, special chemicals, precursor products), daily necessities, cosmetics and sanitary products, rubber and plastic products, ceramic products, glass products, jewelry (rough diamonds, loose diamonds) Excluding), mineral products (except specialized products), wood and wood products, paper and papermaking raw materials, building materials (except steel and cement), mechanical equipment, electromechanical equipment, home appliances, electronic communication equipment, Wujinjiaodian, culture, sporting goods and equipment, toys, arts and crafts (except cultural relics) and commission agency (except auctions), and provides supporting services wholesale; food circulation (except grain); corporate management consulting; business information consulting. [Projects that require approval according to law can only be carried out with approval from relevant departments]