Why do air filters mainly have primary air filters, medium - effect air filters and efficient air filters? The reason is simple. Air filters are graded according to the efficiency of filtration.Air filter classification was born: with the development of microelectronics industry, more and more strict with air filter, especially high efficiency filter, the German standard DIN24183 first put forward "the Most easy to penetrate the Particle Size" (the Most Penetrating Particle Size, the MPPS) method, and USES the Most easily penetrate Particle Size to test the efficiency of air filters. In fact different filter material and filter speed is the Most easy to penetrate the Size is different, generally in the range of 0.11 0.25 um um -. Then the order Size to test its efficiency or use http://fanyi.youdao.com/# to scan experiment.
MPPS are by far the most rigorous test standards, specific test method generally USES the DOP. DOP (phthalic dioctyl ester) method: experimental dust source is 0.3 um single dispersed phase DOP droplets, dust measuring instrument for the photometer, with gas sample turbidity difference to determine the filter filtration efficiency of DOP particles. The current flow gradually adopted the laser particle counter and condensation nucleus counter to filter the entire wind surface scan test
