Imported PTFE coated polyester fiber or flame retardant filter material, with small pore size and high precision; Smooth surface of filter material, easy to clear ash; High filtration accuracy, can effectively intercept the dust particles, the efficiency can reach 99.999%; Stable chemical properties; Good corrosion resistance. The scope of application is applicable to plasma, laser cutting, welding fume and other public conditions in large steel structure, shipbuilding, automobile manufacturing, metal processing and other industries. Bustard powder, aluminum powder and other precious nonferrous metals, the recovery and utilization of pharmaceutical powder. Installation method screw hoisting and various installation methods.