It is mainly used to capture particulate dust and various floating objects in the air, as the end filter of various filtration systems. The ultra-fine glass fiber paper is used as the filter material, and the plastic sheet, aluminum foil board and other materials are folded as the splitting board and sealed with a new type of polyurethane sealant, and the galvanized sheet, Stainless steel plate and aluminum alloy profile are made of outer frame.