HEPA filters are mainly used for trapping 0.5um coarse dust and suspended matter. Using ultra-fine glass fiber filter paper, offset paper dividers, aluminum and other materials, with the wooden box, aluminum alloy glued together. Each tested na yan, with high filtration efficiency, low resistance and large dust holding capacity and so on. High efficiency particulate air filters are widely used in optical electronics, LCD liquid crystal manufacturing, biomedical, precision instruments, food and beverage, PCB printing industry clean workshop of air-conditioning terminal of the supply air.