The pre-filter is mainly used to filter dust particles above 5 μm, as the primary filtration of central air conditioning and centralized air supply system, plays the role of protecting the after end filter. The pre-filter usually has three styles: panel type, pleated type and pocket type, the frame material can be cardboard, aluminum, galvanized, etc., the filter material can be non-woven fabric, nylon mesh, activated carbon filter material, metal mesh, etc., and protective net can be double-side sprayed iron wire mesh and double-side galvanized wire mesh, filtration grade G1, G2, G3, G4,etc. .
The pre filter is made of high-efficiency and low-resistance non-woven material pleated with mesh, the frame can be aluminum frame, stainless steel frame or galvanized frame, high dust holding capacity, often used in the prefiltration of central air conditioning ventilation systems, semiconductor, pharmaceutical, food, electronics, hospital and other air conditioning systems.