... Reused 3.G4 efficiency 4.Color ,White, Supply 5 mm Pre Air Filter Material Features1.Using polyester, polyamide, nylon, etc ... of dust catching450g/m2600g/m2520g/m2460g/m2400g/m2 ApplicationApply to electronic, pharmaceutical, food and other industries as prevention and ... controof pollution, filtration of fresh air, pre-filtering prior to medium efficiency filter efficiency filter, as ...