How to distinguish HEPA filter grade? What is True HEPA? When it comes to True HEPA (true efficiency), what we have to talk about is: What is the filtration efficiency of the air purifier filter? Many people will say, “I use the filter grade is H13”, then what is the evaluation criteria of H13? According to the EU EN1882 standard, the filter mesh with a particle size of 0.3 um has a filtration efficiency higher than 99.97%, which is called H13. According to the current domestic statistical data, the purification efficiency of domestic air purification products is still in the range of 90%~95%@0.3 um, which is at best a sub-efficient filter. To be careful Generally, HEPA is divided into five grades according to its filtration efficiency: coarse filter, medium filter, sub-high filter, HEPA high-efficiency filter and ultra-high-efficiency filter. Details are shown below. High-efficiency_particulate_arrestance referred to as HEPA high-efficiency particulate filter, we often call
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