Deep-pleated HEPA use ultra-fine glass fiber filter paper as filter material, with rubber paper, aluminum foil and other materials folded as a separation, new polyurethane sealant sealing, galvanized sheet, stainless steel plate, aluminum alloy profile as the outer frame, each of which will be strictly tested. End-of-line filtration for cleanroom, commercial and ventilation and air conditioning systems; end filtration in electronics, medicine, hospital, food and other industries.