... the high cleanliness termainal filter Our air filter has certificates of ISO9001, ISO2000 . Material: glass fiber, Frame:stainless steel ... alloy, galvanized steel sheet or stainlesss steelsheet.2. Provide three classifications of filter efficiency : high, sub-high and medium High ... equipments in China,which is the mainly the manufacture of filter elements,filtration equipments as well as a combintion ...