High efficiency filter - It is mainly used to capture particulate dust and all kinds of suspended matter below 0.5 um. Using ultra-fine glass fiber paper as filter material, offset paper, aluminum film and other materials as cutting board, and wood frame aluminum alloy glued. Each unit has been tested by flame method, which has the characteristics of high filtration efficiency, low resistance and large dust capacity. It is widely used in various local purification equipment and clean workshop to purify ambient air under normal temperature, humidity and atmospheric pressure