Development of a novel layered gradient filter based on test method by EN 779-2012

Introduces the function of general ventilation air filter and its selection principle, and compares the test methods between GB/T 14295—2008 in China and EN 779-2012 in EU. Performs the performance test among air filters A, B and C with the test rig. Obtains the thickness, resistance, filtration efficiency and microscopic morphology. With the analysis of quality factor, the performance of filter A is the best for PM2.5, which reaches 0.102. Filter A has the characteristic of low resistance and high efficiency, where the dust holding capacity and interception efficiency are increased by the enlarged three-dimensional space with the strong holder. The quality factor of filter B reaches 0.077. Filter media B has the uniform distribution of fibers, which can increase the efficiency. The combination of the process for material A and material B should be the future trend.