... ISO9001 standard5. There is our list of pre-filter as follows: Dimension(mm)Rated Air Flow(m3 ... available, such as air filter, water filter, oil filter, carbon filter, acid filter, oil purifier, filter bag, bag filter, filter cartridge , filter equipments etc.Reason 4Shanghai Baosteel ... when customer place the orderReason 7ISO9001 management system certification passed and our products have export ...