Hengfeng Evergreen Technology Co.,Ltd is a ventilation air filter manufacturer.We constructed our own production plant with full facilities and workers based in mainland China.We are specialized in various of air filters. Our main products include the initial, medium & high efficiency air filter, dust filter, dust bag,gas/liquid filter and whole set of clean equipment which are widely used in automobile, electron, medical,energy, food, building, chemical, tobacco, cement, iron and steel industries.